## Basic College Mathematics (10th Edition)

Published by Pearson

# Chapter 8 - Geometry - 8.5 Triangles - 8.5 Exercises - Page 565: 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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