### Home > GC > Chapter 12 > Lesson 12.2.1 > Problem 12-58

12-58.

**Examine**the triangles below. Decide if each one is a right triangle. If the triangle is a right triangle,**justify**your conclusion. Assume that the diagrams are not drawn to scale. Homework Help ✎

What are the angle measures of an equilateral triangle?

No, all the angles must be 60°.

Use the Pythagorean Theorem to check. (Remember, the hypotenuse is the longest side).

Yes, the side lengths are a Pythagorean Triple.