Question

Find the exact area of a circle with a diameter of 6.4 cm.

Answer 1

32.16990877, approximately 32.17

Explanation:

A=πr^2

if the diameter is 6.4 then the radius is 3.2 since r=d/2

A=π(3.2)^2

A= 32.16990877, this is the exact value

Answer 2

Divide 6.4/2=3.2cm
Then 3.2•3.2=10.24
Next 3.14•10.24=32.2cm