Elementary Geometry for College Students (6th Edition)

Published by Brooks Cole
ISBN 10: 9781285195698
ISBN 13: 978-1-28519-569-8

Chapter 3 - Section 3.2 - Corresponding Parts of Congruent Triangles - Exercises - Page 138: 36b



Work Step by Step

Given: support system of a bridge which has AC=6ft m$\angle$ABC=28$^{\circ}$ m$\angle$CBD=m$\angle$ABC=28$^{\circ}$ because they are corresponding angles of congruent triangles therefore, m$\angle$ABD=m$\angle$ABC+m$\angle$CBD m$\angle$ABD=28$^{\circ}$+28$^{\circ}$ m$\angle$ABD=56$^{\circ}$
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