Question

Given that the circle has a diameter of 20cm, calculate:

The circumference of the circle. leave answer in terms of π
calculate the area of the circle. leave answer in terms of π

Answer 1

The answer to your question is Circumference = 20π cm; Area = 100π cm

Explanation:

Data

diameter = 20 cm

Circumference = ?

Area = ?

Process

1.- Write the formula of Circumference

Circumference = πd

-Substitution

Circumference = 20π

2.- Write the formula of area of a circle

Area of a circle = πr²

-Calculate the radius

radius = diameter/2

radius = 20/2

= 10 cm

-Substitution

Area = (10)²π

-Result

Area = 100π