Circles and Ellipses

- 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 Chords Theorem
- Concentric circles
- Incircles
- Circumcircles

- 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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