### Home > CCG > Chapter 5 > Lesson 5.3.2 > Problem 5-89

5-89.

and

*?*

They must have equal lengths, because if base angles are equal, then the sides opposite them are equal and the triangle is isosceles.

5-89.

and

They must have equal lengths, because if base angles are equal, then the sides opposite them are equal and the triangle is isosceles.