SOLUTION: Prove that the triangle ABC whose vertices are A(2,-1), B(2,1) and C(-1,1) is a right-angled triangle. Calculate its area.

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Question 890737: Prove that the triangle ABC whose vertices are A(2,-1), B(2,1) and C(-1,1) is a right-angled triangle. Calculate its area.
Answer by Alan3354(69443) About Me  (Show Source):
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Prove that the triangle ABC whose vertices are A(2,-1), B(2,1) and C(-1,1) is a right-angled triangle.
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Find the slopes of AB, AC & BC
Find the lengths of the 2 short sides.
area = b*h/2