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Mathematics 9 Online
OpenStudy (anonymous):

Find the area of a triangle with vertices with coordinates (0,9) , (4,6), and (-1,12). Just to clarify, i know i can use distance formula to solve it. But my teacher taught us this "trick", well not a trick but an alternate easier way to do it. Algebra 2.

OpenStudy (anonymous):

The way has to do with matrixes

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