Question

Find the circumference of a circle with diameter 5.42m.

Give your answer rounded to 2 DP
The diagram is not drawn to scale

Answer 1

17.03 meters

Explanation:

The circumference of a circle:

`C=2\pi r \mbox{ or }C=\2d`

where r is the radius and d is the diameter.

Given the diameter here, all you need to do is multiply it by pi:

`\rightarrow C=\pi d\\\rightarrow C=(3.14159...)(5.42)\\\rightarrow C=17.0274...`

Rounded to 2 decimal places, you get 17.03 meters.