Question

Calculate the area of a circle with a diameter of 8cm.
Show all your work.

Answer 1

16π cm^2

Explanation:

The formula for the area of a circle is
`\pi r^(2)`, r being the radius. The radius is always half of the diameter, so in this case, the radius is 4.
`4^(2)` is just 4 * 4 which is 16. Multiply that by π and you get 16π. Or, approximately 50.27 cm^2

Answer 2

A≈50.27cm²

Using the formulas

A=πr2

d=2r

Solving forA

A=1

4πd2=1

4·π·82≈50.26548cm²