A bit of a groaner. Still, my son is a math prof.
Write the expression for the volume of a thick crust pizza with height "a" and radius "z".
Explanation: The formula for volume is π·(radius)2·(height). In this case, pi·z·z·a.
For those who eat too much pizza, the formula is :
height "y" and radius "g".
Explanation: The formula for volume is π·(radius)2·(height). In this case, pi·g·g·y.