## Elementary Geometry for College Students (7th Edition) Clone

Published by Cengage

# Chapter 2 - Section 2.5 - Convex Polygons - Exercises - Page 116: 43

#### Answer

m$\angle$D=221$^{\circ}$

#### Work Step by Step

m$\angle$A+m$\angle$B+m$\angle$C+m$\angle$D=360$^{\circ}$ 20+88+31+m$\angle$D=360 m$\angle$D=221$^{\circ}$

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