a circle
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Any shape with a perimeter of 2: for example an equilateral pentagon with sides of length 0.4
Radius is the distance from the center of a circle to the outer edge, the same as one-half of the diameter of a circle.
The radius is the distance from the center to the outer edge of the circle. You can measure the diameter, the distance from side to side, and divide by 2.
the distance around the edge of the object
Yes. Circumference is the distance around the circle, diameter is the distance across, and radius is the distance from the edge to the center.