Question

which shapes distance around the outer edge is 2πr? a circle b triangle c quadrilateral d segment of a circle

Explanation:

The formula for the circumference (distance around the outer edge) of a circle is \(C = 2\pi r\), where \(r\) is the radius of the circle. A triangle's perimeter is the sum of its three side lengths. A quadrilateral's perimeter is the sum of its four side lengths. A segment of a circle's perimeter is the sum of the arc length and the chord length.

Answer:

A. circle