Question

If the radius of a coinis 20cm, find itssurface area -​

Answer 1

Answer:

800$\pi$cm²

Explanation:

Given parameters:

radius of the coin  = 20cm

Unknown:

Surface area of the coin  = ?

Solution:

A coin is made up of two faces;

  Surface area  = 2(πr²)

Insert the parameters and solve;

     Surface area = 2($\pi x 20^{2}$)

    Surface area = 800$\pi$cm²