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Area & perimeter on the coordinate plane

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Find the area, in square units, of ABC plotted below.
A coordinate plane. Triangle A B C has point A at negative four, negative six, point B at two, negative eight, and point C at negative six, negative two. There is a slanted dashed line connecting from point C to a point D at negative seven, negative five and a dashed line connects from point A to point D. The dashed lines make triangle A B C a right triangle at B C D.
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