Question

To get the whole circle, you run t from 0 to 2 π. Use this information to confirm that the circumference of a circle of radius r measures out to 2 π r units long.

Answer 1

Explanation:

A circle is a two dimensional geometric figure, a line, consisting of the set of all those points in a plane that are equal distant from a given which is the center of the circle.

A circle has angles from 0° to 360° ⇒ 0 to 2π. The distance between any point of a circle and its center is called radius.

A whole circle distance(circumference) will cover a 2π distance with respect with a equal distance from the center of the circle.