# Chapter 1 - Section 1.2 - Informal Geometry and Measurement - Exercises: 39

m$\angle$ 1 = 124$^{\circ}$

#### Work Step by Step

Step 1. m$\angle$ 1 + m$\angle$ 2 = 180$^{\circ}$ Step 2: Substitute in 56 for m$\angle$ v2. m$\angle$ 1 + 56 = 180 Step 3: Subtract 56 from both sides of the equation. m$\angle$ 1 + 56 - 56 = 180 - 56 Step 4: Solve m$\angle$ 1 = 124$^{\circ}$

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