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Circles
Circle - definition
Parts of a circle - a pictorial index
Radius
Diameter
Circumference
Pi
Area of a circle
Annulus
Area of an Annulus
Chord
Tangent
Secant
Intersecting Secant Lengths Theorem
Intersecting Secant Angles Theorem
Intersecting Chords Theorem
Concentric circles
Incircles
Circumcircles
Parts of a Circle
Semicircle
Sector of a Circle
Area of a Sector
Segment of a circle
Area of a Segment
Angles in a Circle
Inscribed Angle
Central Angle
Central Angle theorem
Thales' Theorem
Angle inscribed in a semicircle
Arcs
Arc definition
Major and Minor Arcs
Arc length
Angle measure of an arc
Adjacent arcs
Intercepted Arc
Radius of an Arc or Segment
Sagitta - Height of an Arc or Segment
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Finding the Center of a Circle
Finding the center with compass and ruler
Finding the center with any right-angled object
Equations of a Circle
See 'Equations of a circle' Section
Ellipses
See Ellipse Section
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