# Chapter 1 - Section 1.2 - Informal Geometry and Measurement - Exercises: 44

m$\angle$ ABC = x + y

#### Work Step by Step

Step 1: m$\angle$ 1 + m$\angle$ 2 = m$\angle$ ABC. Step 2: Substitute x for m$\angle$ 1 and y for m$\angle$ 2. Step 3: x + y = m$\angle$ ABC.

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