The area of a triangle with vertices (x1, y1), (x2, y2),
Chapter , Problem 7.4.57(choose chapter or problem)
The area of a triangle with vertices (x1, y1), (x2, y2), and (x3, y3) can be given as the absolute value of the determinant 12 x1x2x3y1y2y3111Use this formula to find the area of each triangle whose vertices are given in Exercises 55 to 58. (4, 9), (8, 2), (-3, -2)
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