Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 8 - Section 8.1 - Area and Initial Postulates - Exercises - Page 361: 48

Answer

Altitude 1: 21 Altitude 2: 63/5

Work Step by Step

We use trigonometry: Altitude 1 $= \frac{21}{sin90^{\circ}}=21$ For the second altitude, we use the angle in the lower right hand corner, which we call x: $sinx = \frac{BF}{21} \\ 3/5 = BF/21 \\ BF = 63/5$
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