Elementary Geometry for College Students (6th Edition)

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

Chapter 3 - Review Exercises - Page 165: 4


1. OA is congruent to OB (given). 2. Since OA is congruent to OB, triangle OBA is an isosceles triangle by definition. 3. The median of an isosceles triangle is the same as the altitude. 4. The altitude forms a right angle with the bottom side. 5. Thus, OC forms a right angle with the bottom side.
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