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

m$\angle$ ABC = 71$^{\circ}$
Step 1: m$\angle$ 1 + m$\angle$ 2 = m$\angle$ ABC. Step 2: Substitute 32 for m$\angle$ 1 and 39 for m$\angle$ 2. 32 + 39 = m$\angle$ ABC Step 3: Simplify 71$^{\circ}$ = m$\angle$ ABC