Question

A circle has a center at (3.5). The point (3,8) is on the circle. What is the circumference of the circle to the nearest tenth of a unit.

Answer 1

usually you'd use the distance formula but since the point (3,8) is directly above the center (3,5) of the circle you can just subtract to find the radius. 8 - 5 = 3
circumference = 2(pi)r
C = 6(pi)