Question

6. The diameter of a circle is 9 feet. What is the measure of its circumference? Round to the nearest tenth.

A. 28.3 ft

B. 63.6 ft

C. 4.5 ft

D. 14.1 ft

Answer 1

A.

`C= 28.3 \ \ feet`

Explanation:

Formula for Circumference is

`C=2\pi r`

We know radius is half of diameter

`r=(d)/(2) \\r=(9)/(2)`

`C=2(3.14)(9)/(2)`

`C=(3.14)9\\C=28.3 feet`