How do i classify triangles using their attributes?

Asphere has a diameter of 10 in. what is the volume of the sphere?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

On ryan's last social studies test there were two types of questions true/false worth 3 points each and multiple choice questions worth 4 points each