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ISEE Upper Level
Mathematics Achievement

Area of Triangle in Coordinate Geometry

Very Hard Geometry Coordinate Geometry

In the Cartesian coordinate plane, consider the triangle formed by the points A(2, 3), B(5, -1), and C(-1, 4). You need to determine the area of this triangle using the formula for the area based on the coordinates of its vertices. The formula for the area of a triangle with vertices at coordinates $(x_1, y_1)$, $(x_2, y_2)$, and $(x_3, y_3)$ is given by:

$$ ext{Area} =\frac{1}{2} imes |x_1(y_2 - y_3) + x_2(y_3 - y_1) + x_3(y_1 - y_2}|$$

Using this formula, compute the area of triangle ABC.

Hint

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