Question

Can a triangle have two right angles, and why or why not?
A. No, because there needs to be a third angle.
B. No, because a triangle must have an obtuse angle.
C. Yes, because it would be a right triangle.
D. Yes, because 90 + 90 = 180.

Answer 1

A. No, because there needs to be a third angle.

Two right angles sum to 180°. Triangle interior angles must sum to 180°, so the third angle would be 0°, which is not allowed (triangle angles must be positive).