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Home > GC > Chapter 12 > Lesson 12.2.1 > Problem 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.  

  1. A triangle with 3 equal sides of 12.

    What are the angle measures of an equilateral triangle?

    No, all the angles must be .

  1. A triangle with sides, 13, 12, and 5.

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

    Yes, the side lengths are a Pythagorean Triple.