triangles? med 5

For almost 2 pages, Descartes talks about triangles. He compares god to a triangle. What really gets me is that he talks about a right triangle but he never mentions an equilateral triangle. Is he saying god is unequal?? With that said, he then talks about the thought of a mountain but with that you also need a valley. I believe he's trying to put the point across that he know the mountain and valley exist but how does he know god exists. But in the next sentence he goes on explaining that existence is inseparable from god, therefore he must exist? or god forces him to think that he exists? complete confusion.