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Radians to Degrees: Multiply by 180 over pi
There are about 6.28 radians in a circle
11.3
Area of Rhombus or Kite: A = 1/2 x d1 x d2
Radius- of a circle, also of polygon when to vertex
Center- of a circle, also of polygon
Central angle- formed by consecutive radii
measure of central angle- 360/# of sides
apothem- distance fr1om center to side(bisects center angle and side
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