Find the circumference of a circle with a diameter of 20 inches.

Question

asked Jun 9, 2019 148k views

2 Answers

John Koerner · Answer 1 · 2019-06-11T04:48:20+0000

The circumference of a circle can be found with this equation:

C = 2
$\pi$ r

"r" is the radius, which is half of the diameter.

The diameter is 20.

20 ÷ 2 = 10

Your radius is 10. Now that you know the radius, you can plug it into the equation:

C = 2
$\pi$ r

C = 2
$\pi$ (10) Multiply 2 and 10 together

C = 20
$\pi$

Your circumference is:

20
$\pi$ inches or 62.8318530718 inches(you should round it if you want lol)