Answer
He forgot about the angles.
Work Step by Step
In order to show that these polygons are truly congruent, Walter must also show that all the corresponding angles are congruent too.
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 4 - Congruent Triangles - 4-1 Congruent Figures - Lesson Check - Page 221: 7
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