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In the coordinate plane, the coordinates of A, B, C are (0,0), (1,2), (3,1), respectively.  Find the area of triangle ABC.

 Jun 3, 2020
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Look up Shoelace Theorem and apply it. Otherwise, you can inscribe the triangle inside a rectangle and subtract the unneeded parts if you want to draw out a coordinate plane.

 

~ mathleteig

 Jun 3, 2020

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