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radius

From center to a point on the circle.

diameter

A straight line passing through the centre of a circle to touch both sides of the circumference.

Circumference

2πr

Center

Each regular polygon has a center because it can be inscribed in a circle.

Circle

in a plane, the set of all points equidistant from a given point

pi

Pi is the formula for how to find the circumference

C=pid

Formula for circumference of a circle

C= 81.92 inches

Find the circumference of a circle with a diameter of 28 in. Use 3.14 for pi

C= 16.014 feet

Find the circumference of a circle with a diameter of 5.1 feet