Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 2 - Section 2.5 - Convex Polygons - Exercises - Page 105: 4

Answer

m$\angle$D=118$^{\circ}$

Work Step by Step

The sum of the interior angles of a pentagon is 540$^{\circ}$. m$\angle$D=m$\angle$B=m$\angle$E 3m$\angle$D+m$\angle$A+m$\angle$C=540 3m$\angle$D+93+93=540 3m$\angle$D=354 m$\angle$D=118$^{\circ}$
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