SUBJECT INDEX

c

Calculator

24 hour time calculator
Math / scientific calculator instructions
Area of a polygon calculator
Angle calculator for angles expressed in Degrees, Minutes, Seconds
Graphical Function Explorer grapher (GFE)
24 hour difference between two times calculator
Math / scientific calculator similar to those from TI, Casio, HP etc
Calculus

Calculus - Second Fundamental Theorem of Calculus
Calculus - Fundamental Theorem of Calculus
Capture

Capturing parts of the screen as an image
Cardinal

Cardinal numbers (Whole numbers or natural numbers)
Cardinality of a set of numbers
Cardinality

Cardinality of a set of numbers
Center

Finding the center of a circle or arc with compass and straightedge or ruler
Center
Points of concurrency
Center of a Polygon
Finding the center of a circle with any right-angled object
Central angle

Central Angle of a Polygon
Central angle of a circle
Central-angle
Central Angle Theorem
Centroid

Median of a triangle - math word definition
Euler line
How to construct the centroid of a triangle with compass and straightedge or ruler
Centroid
Triangle Centers Overview
Triangle centroid definition
Coordinates of a triangle centroid with calculator (Coordinate Geometry)
Chain rule

Calculus - Chain Rule
Chart

Save GFE chart as a link
Chord

Chord - Math word definition
Parts of a circle - Pictorial index
Intersecting Chord Theorem
Circle

How to construct a tangent to a circle at a point
Concentric - Math word definition
Circle and ellipse drawing algorithm
How to construct (draw) the two external tangents to two given circles
Radius of a circle definition and calculator
Area of a circle segment with calculator- Math Open Reference
Segment of a Circle
Intersecting Secant Theorem
How to construct a circle through the 3 vertices of a triangle with compass and straightedge or ruler
Area and height of a circle segment with calculator- Math Open Reference
Finding the center of a circle with any right-angled object
Basic Equation of a Circle
Parametric Equation of a Circle
Diameter of a circle definition and calculator- Math Open Reference
Conic section - circle
How to construct (draw) the two internal tangents to two given circles
Finding the center of a circle or arc with compass and straightedge or ruler
General form of Equation of a Circle
How to construct (draw) tangents to a circle through an external point
Semicircle - math word definition
Chord - Math word definition
Angle inscribed in a semicircle
Intersecting Chord Theorem
Area enclosed by a circle with calculator
Central angle of a circle
Derivation of the formula for the area of a circle
Square inscribed in a circle
Tangent to a circle definition
Area of an annulus
Annulus - Math word definition
Arc - Math word definition
Sector definition
Thales theorem
Area of a sector of a circle
Incircle of a triangle
Circle definition with calculator
Inscribed angle of a circle
How to construct a circle through 3 points with compass and straightedge or ruler
Circumference (perimeter) of a circle with calculator
Derivation of the formula for the circumference of a circle
Secant of a circle definition
Circumcircle
Circumcenter

How to construct circumcenter of a triangle with compass and straightedge or ruler
Triangle Centers Overview
Circumcircle of a Triangle
Triangle Circumcenter definition
Circumcenter
Euler line
Circumcircle

How to construct a circle through 3 points with compass and straightedge or ruler
How to construct a circle through the 3 vertices of a triangle with compass and straightedge or ruler
Circumcircle of a Triangle
Circumcircle
Radius of a Regular Polygon
Circumcircle of a Regular Polygon
Circumference

Circumference (perimeter) of a circle with calculator
Derivation of the formula for the circumference of a circle
Parts of a circle - Pictorial index
Perimeter of an Ellipse
Circumradius

Circumradius
Radius of a Regular Polygon
Circumcircle of a Triangle
Circumscribed

How to construct a circle through 3 points with compass and straightedge or ruler
Circumcircle of a Regular Polygon
Circumcircle of a Triangle
How to construct a circle through the 3 vertices of a triangle with compass and straightedge or ruler
Circumscribed rectangle, bounding box. (Coordinate Geometry)
Circumcircle
Circumscribed
Cite

How advertising on the site works
How to cite Math Open Reference articles
Classification

Classification
Classification of triangles
Classify

Classify
Classification of triangles
Collinear

Collinear - Math word definition
Common core

Common Core alignment
Comparison

Calculus - Comparison Test
Compass

Construction
List of construction worksheets
Compass
Constructions Introduction. Drawing shapes with compasses and straightedge
Complement

Complement
Complementary

Complementary Angles definition
Complementary
Complementary angle using compass and straightedge or ruler
Complex number

Complex numbers - animated definition
Real-number
Number
The letter j - math word definition
Imaginary-number
The letter i - math word definition
Composite number

Prime number - math word definition
Composite number - math word definition
Number
Composition

Calculus - Chain Rule
Concave

Concave Polygon Definition
Concave
Concentric

Concentric - Math word definition
Concurrent lines

Concurrent-lines
Orthocenter of a triangle - math word definition
Triangle incenter, description and properties
Triangle Circumcenter definition
Triangle centroid definition
Points of concurrency
Cone

Volume of a right cone
Slant height of a right cone
Surface area of a right cone
Cone - Math word definition
Derivation of the formula for the area of a cone
Oblique versus right cone - Math Open Reference
Conic section - ellipse
Comparison of a cone and pyramid
Conic section - circle
Congruent

HL Congruent Triangles
Congruent Lines Definition
Reflected Congruent Triangles
Congruent triangles with a common side
Rotated Congruent Triangles
ASA Congruent Triangles
Congruent Polygons- Math Open Reference
Congruent
AAA Doesn't work
AAS Congruent Triangles
Congruent Triangles
Congruent Angles
Congruent Polygon Tests- Math Open Reference
SAS Congruent Triangles
SSA doesn't work
SSS Congruent Triangles
Conic section

Conic section - ellipse
Conic section - circle
Conical

Conical
Comparison of a cone and pyramid
Cone - Math word definition
Construction

Printable instructions for finding the incenter of a triangle with compass and straightedge or ruler
Printable instructions for constructing a hexagon given one side.
Printable instructions for copying a line segment with compass and straightedge or ruler
Printable instructions for constructing the complementary angle to a given angle with compass and straightedge or ruler
Printable instructions for drawing the circumcircle of a triangle with compass and straightedge or ruler
Printable instructions for copying a triangle with compass and straightedge or ruler
Printable instructions for copying an angle with compass and straightedge or ruler
Printable step-by-step instructions for constructing the difference of two angles with compass and straightedge or ruler
Printable instructions for drawing an equilateral triangle with compass and straightedge or ruler
Printable instructions for drawing an ellipse with string and pins
Printable instructions for finding the circumcenter of a triangle with compass and straightedge or ruler
Printable instructions for drawing an angle with a protractor
Printable step-by-step instructions for constructing a segment which is the difference of two given segments with compass and straightedge or ruler
Printable instructions for dividing a line segment into equal parts with compass and straightedge or ruler
Printable instructions for finding the foci of an ellipse with compass and straightedge or ruler
Printable instructions for finding the centroid of a triangle with compass and straightedge or ruler
Printable step-by-step instructions for constructing a segment which is the sum of given segments with compass and straightedge or ruler
Printable instructions for finding the altitude of an acute triangle with compass and straightedge or ruler
Printable instructions for finding the altitude of an obtuse triangle with compass and straightedge or ruler
Printable step-by-step instructions for adding two angles with compass and straightedge or ruler
How to construct an equilateral triangle inscribed in a given circle with compass and straightedge or ruler
How to construct the centroid of a triangle with compass and straightedge or ruler
Printable instructions for drawing a 30-60-90 triangle with compass and straightedge or ruler
Constructing a circle through 3 given points
How to construct circumcenter of a triangle with compass and straightedge or ruler
Printable instructions for drawing a 30 degree angle with compass and straightedge or ruler
Printable instructions for bisecting a line with compass and straightedge or ruler
Finding the center of a circle or arc with compass and straightedge or ruler
Printable instructions for finding the center of a circle with compass and straightedge or ruler
Printable instructions for bisecting an angle with compass and straightedge or ruler
Printable instructions for drawing a 90 degree angle with compass and straightedge or ruler
Printable instructions for drawing the incircle of a triangle with compass and straightedge or ruler
Printable instructions for drawing a 45 degree angle with compass and straightedge or ruler
Printable instructions for drawing a 60 degree angle with compass and straightedge or ruler
Printable instructions for finding the center of a circle with any right angled object
Printable instructions for measuring an angle using a protractor
Printable strp-by-step instructions for drawing a triangle given three sides with compass and straightedge or ruler
How to bisect a segment with compass and straightedge or ruler
How to bisect an angle with compass and straightedge or ruler
Constructing 75, 105, 120, 135, 150 degree angles and more
Printable instructions for drawing a triangle given two sides and included angle with compass and straightedge or ruler
Printable instructions for constructing a right triangle with given leg lengths with compass and straightedge or ruler
Printable step-by-step instructions for drawing a triangle given two angles and included side with compass and straightedge or ruler
Printable instructions for constructing a right triangle with given angle and hypotenuse with compass and straightedge or ruler
Printable instructions for constructing a right triangle with given leg and hypotenuse with compass and straightedge or ruler
Printable instructions for constructing a right triangle with given angle and one leg (LA) with compass and straightedge or ruler
How to construct a 90 degree angle with compass and straightedge or ruler
How to construct a 60 degree angle with compass and straightedge or ruler
How to add two angles with compass and straightedge or ruler
How to construct a circle through 3 points with compass and straightedge or ruler
How to construct a 30-60-90 triangle with compass and straightedge or ruler
List of construction worksheets
Sum of line segments using compass and straightedge or ruler
How to construct (draw) one of the three altitudes of a triangle
How to construct (draw) a 45 degree angle with compass and straightedge or ruler
How to construct a 30 degree angle with compass and straightedge or ruler
How to construct (draw) one of the three altitudes of an obtuse triangle
Printable step-by-step instructions for constructing a triangle given two angles and non-included side (AAS) with compass and straightedge or ruler
Printable instructions for constructing one of the two internal tangents to two given circles.
Printable instructions for constructing an isosceles triangle given a side and apex angle
Printable instructions for drawing the medians of a triangle with compass and straightedge or ruler
Printable instructions for finding the midsegment of a triangle with compass and straightedge or ruler
Printable instructions for finding the orthocenter of a triangle with compass and straightedge or ruler
Printable step-by-step instructions for drawing an isosceles triangle with compass and straightedge or ruler - II
Printable step-by-step instructions for drawing an isosceles triangle with compass and straightedge or ruler
Printable instructions for constructing a hexagon inscribed in a given circle.
Printable instructions for constructing a pentagon inscribed in a given circle.
Printable instructions for constructing a square inscribed in a circle with compass and straightedge or ruler
Printable instructions for drawing parallel through a point with compass and straightedge or ruler
Printable instructions for drawing parallel through a point (rhombus method)
Printable instructions for constructing the supplementary angle to a given angle with compass and straightedge or ruler
Printable instructions for drawing a tangent at a point on a circle with compass and straightedge or ruler
Printable instructions for drawing tangents to a circle from a point with compass and straightedge or ruler
Printable instructions for constructing tangents to two given circles.
Printable instructions for constructing a square of a given side length with compass and straightedge or ruler
Printable instructions for drawing a perpendicular at a point on a line with compass and straightedge or ruler
Printable instructions for drawing parallel through a point with compass and straightedge
Printable instructions for drawing a perpendicular at the end of a ray with compass and straightedge or ruler
Printable instructions for drawing a perpendicular to a line through a point with compass and straightedge or ruler
Printable instructions for constructing an equilateral triangle inscribed in a given circle.
Finding the center of a circle with any right-angled object
How to construct (draw) tangents to a circle through an external point
How to construct (draw) the two external tangents to two given circles
How to construct (draw) the two internal tangents to two given circles
How to construct a tangent to a circle at a point
Supplementary angle using compass and straightedge or ruler
How to construct the incenter of a triangle with compass and straightedge
How to construct (draw) a square
How to construct a triangle given two angles and a non-included side
How to construct a triangle given two angles and the included side
How to construct a triangle given two sides and the included angle
How to construct (draw) a triangle given three sides
How to construct (draw) an equilateral triangle with compass and straightedge or ruler
How to construct (draw) a right triangle with two given leg lengths (LL)
How to construct (draw) a right triangle with a given one angle and one leg (LA)
How to construct (draw) a right triangle with a given one angle and hypotenuse (HA)
How to construct (draw) a right triangle with a given leg and hypotenuse (HL)
Constructions Introduction. Drawing shapes with compasses and straightedge
How to construct (draw) the incircle of a triangle with compass and straightedge or ruler
How to construct (draw) an isosceles triangle given base and altitude with compass and straightedge or ruler
Construct an isosceles triangle with given leg and apex angle with compass and straightedge or ruler
How to construct (draw) the medians of a triangle
How to construct an isosceles triangle given base and one side
How to construct a square inscribed in a circle with compass and straightedge or ruler
How to construct a regular hexagon inscribed in a circle with compass and straightedge or ruler
Constructing a regular pentagon inscribed in a circle
How to construct midsegment of a triangle with compass and straightedge or ruler
How to construct (draw) the orthocenter of a triangle- Math Open Reference
How to construct (draw) a perpendicular from a line through a point
How to construct (draw) a perpendicular at a point on a line
Construction
How to construct (draw) a perpendicular at the end of a ray with compass and straightedge or ruler
How to construct a parallel through a point (translated triangle method) with compass and straightedge or ruler
How to construct a parallel through a point with compass and straightedge or ruler
How to construct (draw) a parallel through a point with compass and straightedge or ruler (rhombus method)
Finding the foci an ellipse
How to construct a regular hexagon given one side with compass and straightedge or ruler
How to copy an angle with compass and straightedge or ruler
Copying a triangle with compass and straightedge or ruler
Copying a line segment with compass and straightedge or ruler
Complementary angle using compass and straightedge or ruler
Difference of two line segments using compass and straightedge or ruler
Difference of two angles using compass and straightedge or ruler
How to construct (draw) an ellipse
How to construct a circle through the 3 vertices of a triangle with compass and straightedge or ruler
Dividing a line segment into N equal parts with compass and straightedge or ruler
Constructions

Teaching Geometric Constructions using Math Open Reference
Contents

Table of Contents
Continuity

Calculus - Informal continuity
Calculus - Formal approach to continuity
Continuous

Calculus - making a function continuous and differentiable
Convergence

Calculus - Ratio Test
Convex

Convex
Convex Polygon Definition
Coordinate

Basic Equation of a Circle
Coordinates

Equation of a line - slope and intercept form. (Coordinate Geometry)
Coordinates
Print blank graph paper
Distance between points
Equation of a line - point - slope form. (Coordinate Geometry)
Area of any polygon (Coordinate Geometry)
Coordinates of a regular polygon
Coordinates of a point
Ray definition (Coordinate Geometry)
Intercept (b) of a line (Coordinate Geometry)
Origin - math word definition
Slope (m) of a line (Coordinate Geometry)
The Coordinate Plane
Line Segment definition (Coordinate Geometry)
Introduction to Lines in Coordinate Geometry
Line definition (Coordinate Geometry)
Introduction to Coordinate Geometry
Midpoint Theorem (Coordinate Geometry)
Teaching Notes: Limitations of the applets in the coordinate geometry section
Coplanar

Coplanar - Math word definition
Introduction to plane geometry
Corresponding

Corresponding
Corresponding Angles definition
Cos

Cosine - math word definition
COS - Math word definition
The trigonometry arccos() function - inverse cosine - math word definition
Graph of the Cosine function - Trigonometry
Trigonometry Overview
Cosecant

Introduction to the 6 trigonometry functions
Cosecant
Calculus - trigonometric Functions
Cosine

SOHCAHTOA - math word definition - Trigonometry
Calculus - trigonometric Functions
The trigonometry arccos() function - inverse cosine - math word definition
Proof of the Law of Cosines
Cosine - math word definition
The Law of Cosines
Graph of the Cosine function - Trigonometry
Solving Triangles
Introduction to the 6 trigonometry functions
Cot

COT - Math word definition
Cotangent
Cotangent

Calculus - trigonometric Functions
Cotangent
Introduction to the 6 trigonometry functions
Coterminal

Coterminal - math word definition
Counting number

Counting numbers (Whole numbers or natural numbers)
Number
Natural number - math word definition
Cardinal numbers (Whole numbers or natural numbers)
Whole number - math word definition
Cpctc

Cpctc
Csc

CSC - Math word definition
Cosecant
Cube

Surface area of a cube with calculator
Volume of a cube with calculator
Platonic solid
Cube definition with calculator
Cubic

Cubic curve and graph display
Cubic
Curve

Calculus - Curve analysis - special cases
Calculus - Curve Analysis - Global Extrema
Calculus - Basic curve analysis
Cyclic

Inscribed (cyclic) quadrilateral
Interior angles of an inscribed quadrilateral
Diagonals of an inscribed quadrilateral
Area of an inscribed quadrilateral
Cylinder

Surface area of a cylinder with calculator
Derivation of the surface area of a cylinder
Cylinder definition and properties
Cylinder as the locus of a line
Relation of a cylinder to a prism
Volume of a cylinder segment with calculator
Volume of a cylinder with calculator
Oblique cylinder
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