Hey, let s consider two planes, and they make an angle a between them. On one of the planes there is a figure with the surface S. I want to prove that the surface of the same figure projected on the second plane is equal to the surface of the figure on the first plane times the cosine of the angle formed between the two planes.
P.S: 1- Sorry for any English mistakes i ve translated this from french
2- I make no distinguishment between area and surface so consider the right term
P.S: 1- Sorry for any English mistakes i ve translated this from french
2- I make no distinguishment between area and surface so consider the right term