1. A piece for a board game is shaped like a triangular prism. The piece is 18mm long, and the base of the piece is an equilateral triangle with side lengths 10mm and 9mm. Find the surface area of the piece.
I just have a quick question,
In the second part of the question, you said that the equilateral triangle has a side length of 10 and 9.
How can this be possible?
Hmm, width=10, length=9? I forget, I will tell you tomorrow.