Question

Circle O has a circumference of 36tt cm. what is length of the radius r

Answer 1

The radius = 18 cm.

Explanation:

I am assuming that is 36π.

If so, then circumference = 2 π r and:

2 π r = 36 π

r = 36π / 2π

r = 18.

Answer 2

5.73cm

Explanation:

Given parameters:

Circumference of the circle = 36cm

Unknown

Length of the radius = ?

Lets represent the radius by r

Solution

The circumference of a circle is the defined as the perimeter of a circle. The formula is given as:

Circumference of a circle = 2πr

Since the unknown is r, we make it the subject of the formula:

r =
`(circumference of the circle)/(2π)`

r =
`(36)/(2 x 3.142)` =
`(36)/(6.284)` = 5.73cm