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

Monday, November 19, 2012

The formula that gives the circumference of a circle
is:

Circumference = $\displaystyle\pi$ *2r, where r represents the radius
of th circle.

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

40 = $\displaystyle\pi$
*2r

r = 40/2 $\displaystyle\pi$

r =
20/ $\displaystyle\pi$

We'll take $\displaystyle\pi$ =
3.14

r = 20/3.14

r = 6.36
cm

The requested radius of the circle is of
6.36 cm.

Notes