Question

A 45-45-90 set square is ____.

• A. an equilateral triangle
• B. an isosceles triangle
• C. a right triangle
• D. a scalene triangle

Answer 1

Answer: (B), (C)

The correct options are
B

an isosceles triangle

C

a right triangle

The 45-45-90 set square is a triangle whose angles are 45${}^{\circ }$, 45${}^{\circ }$ and 90${}^{\circ }$.

Thus, the triangle has two equal sides. Therefore, a 45-45-90 set square is an isosceles right triangle.