Please help me with this question in my math

Which best explains why this triangle is or is not a right triangle?

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

The function show two sisters' savings account and the rate at which they plan to deposit money