The letter j - math word definition The letter i - math word definition Complex numbers - animated definition Imaginary-number Platonic solid Icosahedron - A regular polyhedron with 20 faces - One of the platonic solids Trigonometry identities Identity Complex numbers - animated definition The letter i - math word definition The letter j - math word definition Real-number Number Imaginary-number Calculus - Improper Integrals How to construct the incenter of a triangle with compass and straightedge How to construct (draw) the incircle of a triangle with compass and straightedge or ruler Incenter Incenter coordinates of a triangle with calculator (Coordinate Geometry) Triangle Centers Overview Incenter of a regular polygon Triangle incenter, description and properties Triangle incircle definition Incircle Incircle of a triangle Incenter of a regular polygon Incircle of a Polygon How to construct the incenter of a triangle with compass and straightedge How to construct (draw) the incircle of a triangle with compass and straightedge or ruler Triangle incircle definition Included - math word definition Triangle given two angles and the included side (ASA) Area of a triangle (Side-angle-side method) with calculator Included side definition Included angle definition Triangle inequality theorem- Math Open Reference Inequality (opposite of equation) Triangle inequality theorem converse Initial side - math word definition - Trigonometry Incircle of a Polygon Triangle incircle definition Inradius Diagonals of an inscribed quadrilateral Parallelogram inscribed in a quadrilateral Triangle incircle definition Arc Peripheral Angle Inscribed (cyclic) quadrilateral Inscribed - math word definition Area of an inscribed quadrilateral Square inscribed in a circle Inscribed angle of a circle Incircle of a triangle How to construct a square inscribed in a circle 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 a regular hexagon inscribed in a circle with compass and straightedge or ruler Angle inscribed in a semicircle Constructing a regular pentagon inscribed in a circle Calculus - Instantaneous Velocity Integer Number Calculus - Improper Integrals Calculus - Properties of Definite Integrals Calculus - Polar Area Calculus - Functions defined using integrals Calculus - Riemann Sums Calculus - Integral Test Calculus - Integration By Substitution Equation of a line - slope and intercept form. (Coordinate Geometry) Intercept (b) of a line (Coordinate Geometry) Intercepted arc Introduction to Lines in Coordinate Geometry Polygon Interior Angles Interior angles of an inscribed quadrilateral Triangle interior angles definition Interior / exterior angles of a polygon Interior Angles of a transversal definition Alternate Interior Angles definition Interior - math word definition Interior of an angle definition Calculus - Intermediate Value Theorem Intersection - math word definition Intersecting Chord Theorem Intersecting Secant Angles Theorem Intersecting Secant Theorem Intersecting lines. (Coordinate Geometry) Number The trigonometry arccos() function - inverse cosine - math word definition The inverse trigonometry functions The trigonometry arcsin() function - inverse sine - math word definition The trigonometry arctan() function - inverse tangent - math word definition Calculus - Invertible Functions Number Irrational number - math word definition Area of an Irregular Polygon Irregular polygon - math word definition How to construct (draw) an isosceles triangle given base and altitude with compass and straightedge or ruler Isosceles triangle - math word definition Construct an isosceles triangle with given leg and apex angle with compass and straightedge or ruler How to construct an isosceles triangle given base and one side Calculus - Intermediate Value Theorem