Question

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

Answer 1

800
`\pi`cm²

Step-by-step 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