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.

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) (Show Source): You can put this solution on YOUR website!
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
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