12. The vertices of A ABC are A(2, 9), B(-2, 1) and C (6, 3) and its area is 28. Find the length of the altitude from A to BC.
[Hint: Use area of triangle1/2 x base x altitude.)
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0.5× √68× x = 28
x = 16/2√17
x =8√17 ÷17
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