Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 8 - Geometry - 8.5 Triangles - 8.5 Exercises: 20

Answer

Each triangle can be looked at as half of a parallelogram.

Work Step by Step

Since the formula for area of a parallelogram is $A$ = $b$$h$ one would add the $\frac{1}{2}$ to compensate for the fact that it is $\frac{1}{2}$ of the total area of the parallelogram.
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