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Level 90

Circumference & Area of Circles


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Circle
in a plane, the set of all points equidistant from a given point
Center
Each regular polygon has a center because it can be inscribed in a circle.
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.
pi
the ratio of the circumference to the diameter of a circle
Circumference
The distance around a circle