Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 3 - Parallel and Perpendicular Lines - 3-3 Proving Lines Parallel - Practice and Problem-Solving Exercises: 51

Answer

The image below is a concave pentagon.
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Work Step by Step

This shape is a pentagon because it has 5 interconnected line segments. It is concave because one of the diagonals points outside the pentagon. One portion of the pentagon appears to have "caved in."
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