In the coordinate plane, A = (-4,4), B = (0,7), and C = (2,-2). What is the area of triangle ABC?
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\(\color{blue}◬ABC=◬BOA+◬BOC\\ =\frac{7\cdot 4}{2}+\frac{7\cdot2}{2} \)
\(=21\)
The area of triangle ABC is 21.
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