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$^{2}$
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 8 - Geometry - 8.5 Triangles - 8.5 Exercises - Page 567: 21
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