Circles - Area, Circumference and Pi
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Approximation of pi
3.14 or 22/7
Area of a Circle Equation
Area = Pi times r squared
Circumference Equation
C=πd or C=π2r
Circumference
Distance around a circle
Radius
Segment that has one endpoint at the center and the other endpoint on the circle
Diameter
Segment that passes through the center and has both endpoints on a circle
Circle
Set of all points in a plane that are the same distance from a center
Pi (π)
The ratio of a circle's circumference to its diameter π = C/d
Diameter Equation
d=2r (d=diameter; r=radius)
Radius Equation
r=1/2d or r=d/2 (d=diameter; r=radius)