Question

3) The circle below has a diameter of 8 cm.

a) Find the radius of the circle. Don’t forget the unit!

b) Find the area of the circle. Use 3.14 to approximate pi. Please show your math work step by step and don’t forget the unit. (Calculator is allowed but please write down the numbers that you enter into your calculator).

Answer 1

a) 4cmb

b) 50.24cm²

Explanation:

a) r=d/2

 =8/2

 =4cm

b) area of circle = 3.14×4²

 =3.14×16

 =50.24cm²

Answer 2

a) 4 cm

b) 50,24 cm^2

Explanation:

Given:

A circle

d (diameter) - ?

Find: a) r (radius) - ? b) A (area) - ?

.

a) The radius is half diameter:

`r = (1)/(2) * d`

`r = (1)/(2) * 8 = 4 \: cm`

.

b) Use this formula to find the area of the circle:

`a = \pi {r}^(2) = 3.14 * {4}^(2) = 50.24 \: {cm}^(2)`