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OpenStudy (anonymous):
Calculate the area of triangle ABC with altitude CD, given A(−7, −1), B(−1, 5), C(0, 0), and D(−3, 3). 9 square units 18 square units 18.5 square units 21 square units I know the area is found by 1/2*b*h With this I got 9, is it choice 1?
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