- Points in a plane equidistant from a given center
- Circle
- Cirlcles that have the same radius
- Congruent circles
- Distance from center to a point on the circle
- Radius
- Distance across a circle, through center
- Diameter
- Segment with end points on a circle
- Chord
- A line that intersects a circle in two points
- Secant
- A line that intersects a circle I’m exavrly one point
- Tangent
- Part of a circle (circumference) that measures less than 180*
- Minor arc
- 2€r
- Circumference
- Part of a circle (circumference) that measure greater than 180*
- Major arc
- Part of a circle (circumference) that measures exactly 180*
- Semi-circle
- Angles that are formed by two line segments that have a vertex on the center
- Central angles
- Arc formed by an angle inside the arc
- Intercepted arc
- (Tan)^2=o•ws
- Secant-tangent
- A•b=c•d
- Intercepting chord
- 1/2(big arc + small arc)
- Exterior interception
- A(a+b)=c(c+d)
- Secant- secant
- tangent=tangent
- Tangent-tangent
- 1/2(arc +arc)
- Interior interception
- (0/360) 2€r
- Arc length
- (0/360)€r^2
- Area of a sector
- Angle=1/2 arc
- Tangent- chord
- Opp. Angles supplementary
- Inscribed quadrilateral
- coplaner circles with the same center
- Concentric circles
- (o/360) €r^2 - 1/2 bh
- area of a minor arc

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