Answer
5
Work Step by Step
First of all, we see that point C is $(-5,3)$, for it is C reflected across the y axis. Now, we can find the height and the base of the triangle:
$ b = 5 - (-5) =10$
$h = 3 - 1 = 2$
Thus:
$ A = (1/2)(2)(5) = 5$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 10 - Section 10.1 - The Rectangular Coordinate System - Exercises - Page 457: 36
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