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)


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