A custodian carries a large key ring. He measures it and calculates that it has a circumference of 25.12 centimeters. What is the key ring's radius?

Question

asked Jul 24, 2021 205k views

1 Answer

VMykyt · Answer 1 · 2021-07-29T04:49:26+0000

By definition of
$\pi$ , we have

$\pi=(C)/(d)$

and we deduce

$d = (C)/(\pi)$

Now, recall that the diameter is twice the radius:

$2r=(C)/(\pi)$

and solve for
:

$r=(C)/(2\pi)$

So, divide the circumference by
$2\pi$ and you'll find the radius.