Question

Find the area of a circle whose circumference is 31.4 centimeters.

Answer 1

Okay, first step - what is the formula for circumference?

Answer 2

31.4?

Answer 3

31.4 is the value of the circumference given to you.

Do you know the formula used to calculate circumference?

Answer 4

Nope

Answer 5

Is it gonna be 3.14

Answer 6

2 *pi *r = 31.4
r=31.4/(2*3.14)
r=5
area = pi r*r
=3.14*5*5
=78.5

Answer 7

Well, the formula for the circumference of a circle is $$ 2 \pi r $$