Question 934754
Hint:


The frustum is the base of the cone when you chop off the top piece (see pic below)


<img src = "http://image.mathcaptain.com/cms/images/67/frustum-of-a-cone.png">


So the idea is to find the lateral surface area of the larger cone, then subtract off the lateral surface area of the smaller top cone. The same applies for the volumes as well.