There should be a section about it on your homework. If you can't find any information try looking it up. Also, right triangles are 90 degrees, I hope this helps!
Answer:
They usually have steep, sloping sides and sharp or rounded ridges, and a high point, called a peak or summit.peak — the pointed top of a mountain; a mountain with a pointed top. summit — the highest point of something, especially the top of a mountain.
Explanation:
I really wanted to know that also :)
C- Mariana Trench. It’s the only different form the rest. The others are a consequence of plates subduing or getting under another plate and pushing up.