Question

The diameter of a circle is 4 kilometers. What is the circle's circumference?

Answer 1

12.57 km

Explanation:

Radius = 4 / 2 = 2 km

Circumference = 2πr = 2π(2) = 4π = 12.57 km

Answer 2

12.56km

Explanation:

C=2pi r

2r=d

C=pi d=4pi=4x3.14=12.56km