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Home > GC > Chapter 5 > Lesson 5.3.2 > Problem 5-79

5-79.

Lizzie noticed that two angles in , shown below, have the same measure. Based on this information, what statement can you make about the relationship between and ?
Triangle D, E, F, with angle, D, labeled 54 degrees, and angle, F, labeled 54 degrees.

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