Question

A circular post in an office building has a diameter of 5 feet. Which of

these is closest to the circumference of the post?

7.8 ft
15.7 ft
31.4 ft
19.6 ft

Answer 1

15.7

Explanation:

Circumference = πd

π = 3.14

d = diameter (5 feet)

C = 3.14(5)

C = 15.7

Answer 2

15.7 feet

Explanation:

The circumference is equal to π × diameter.

3.14 × 5

= 15.7

The circumference of the circular post is 15.7 feet.