It's a perfectly rounded 2 dimensional shape
Its perimeter is better known as its circumference
Its diameter spans its circumference cutting through its centre
Its circumference divided by its diameter is the value of pi which is an irrational number
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has 4 sides and 4 angles
circumference is 2 times pi times radius area is pi times readius squared
The area of a circle with a radius of 4 is: 50.27 square units.
A circle has only one measure for its radius. A shape that has a "radius" of 3 in by 4 in cannot be a circle.
There are 4 quadrants in a circle