Geometry: Common Core (15th Edition)

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

Chapter 2 - Reasoning and Proof - 2-3 Biconditionals and Definitions - Got It? - Page 100: 4


a) no b) Obtuse angles have measures greater than 90 and less than 180.

Work Step by Step

a) Since rectangles also have 4 right angles, the statement is not reversible and is not a good definition. b) The phrase "greater than acute angles" is not precise, so the example is not a good definition.
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