## Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole

# Chapter 3 - Section 3.1 - Congruent Triangles - Exercises: 21

#### Answer

Side AD and side EC are congruent.

#### Work Step by Step

Considering the congruent pairs marked, the additional pair of parts that must be congruent for us to use the SAS method are: side AD of triangle $\triangle$ABD and side EC of triangle $\triangle$CBE.

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