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: 21

Answer

7.875 ft$^{2}$ of fabric is needed to make the door.

Work Step by Step

Area of a Triangle: $A$ = $\frac{1}{2}$$b$$h$ Therefore: $A$ = $\frac{1}{2}$(3$\frac{1}{2}$ ft )(4$\frac{1}{2}$ ft) $A$ = (0.5)(3.5 ft)(4.5 ft) $A$ = 7.875 ft$^{2}$
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