I was studying for exams when I stumbled across this question.
A block of earth in the form of truncated right prism has a square base with 12 centimeter edges. Two adjacent lateral edges are each 20 centimeter long and the other two lateral edges are each 14 centimeter long. Find the total surface area of the block.
This is how I imagined the problem:
From here, I'm stuck.
I do know there are six areas found. I can find the area of the base, but I couldn't find the other 5 areas, in which two of those areas (the front and the back) has angled upper base. I don't know how to get those areas that involve angled upper bases.
How do you get the surface area of the above problem?