# A circle has the circumference of 40 cm. What is the radius of the circle ?

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Student Comments

giorgiana1976 | Student

The formula that gives the circumference of a circle is:

Circumference = `pi` *2r, where r represents the radius of th circle.

We'll replace the known values within the formula of circumference:

40 = `pi` *2r

r = 40/2`pi`

r = 20/`pi`

We'll take `pi` = 3.14

r = 20/3.14

r = 6.36 cm

**The requested radius of the circle is of 6.36 cm.**