Question

A circle has a diameter of 4 meters. What is its perimeter (to the nearest hundredth)? What is its area (to the nearest hundredth)?

Answer 1

C ≈ 12.56 m, A ≈ 12.56 m²

Explanation:

The formula of a perimeter (circumference) of a circle:

`C=d\pi`

d - diameter

The formula of an area of a circle:

`A=\pi r^2`

r - radius

We have d = 2r = 4m → r = 2m.

Substitute:

Use π ≈ 3.14

`C=4\pi\ m\approx(4)(3.14)=12.56\ m`

`A=\pi(2^2)=4\pi\ m^2\approx(4)(3.14)=12.56\ m^2`