math

show that the triangle with verticies A(8,5) B(1,-2) C(-3,2) is a right triangle, and find its area.

the answer to the area is : 28.
please show me how to show its a right triangle, thanks!

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  1. compute the side lengths.
    You know that if the sides obey a^2 + b^2 = c^2, it is a right triangle!

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