# Math Help - Cylinder

1. ## Cylinder

A cake has a cylindrical shape with an altitude of 4cm, and radius of 2cm. The top of the cake is decorated with 1/2 inch layer of icing. What is the total volume of the icing of the cake?

2. Hello reiward
Originally Posted by reiward
A cake has a cylindrical shape with an altitude of 4cm, and radius of 2cm. The top of the cake is decorated with 1/2 inch layer of icing. What is the total volume of the icing of the cake?
Are you sure you have the units right? You have mixed cm and inches.

But, assuming that you can get the units sorted out, the icing is itself a cylinder of height 1/2 and radius 2. Its volume is given by:
$V = \pi r^2 h$
I'm sure you can use this simple formula to get the right answer.