# Chapter 2 - Section 2.1 - The Parallel Postulate and Special Angles - Exercises - Page 87: 4a

m$\angle$5=110.8$^{\circ}$

#### Work Step by Step

If two parallel lines are cut by a transversal, then the pairs of alternate angles are congruent. Since we are given that lines l and m are parallel, and $\angle$4 and $\angle$5 are alternate angles, we know that $\angle$4 and $\angle$5 are congruent. Since $\angle$4=110.8$^{\circ}$, $\angle$5 must also be 110.8$^{\circ}$.

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