SOLUTION: please help I am so confuse how to do this type of problem Floor plans for a building have the four corners of a room located at then points (2, 3), (11, 6), (-3, 18), and (8, 2

Question 90068: please help I am so confuse how to do this type of problem
Floor plans for a building have the four corners of a room located at then points (2, 3), (11, 6), (-3, 18), and (8, 21).determine whether the side
through the points (2, 3) and (11, 6) is perpendicular to the side through the points(2, 3) and (-3, 18).

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
determine whether the side through the points (2, 3) and (11, 6) is perpendicular to the side through the points(2, 3) and (-3, 18).
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slope of the side thru (2,3), (11,6) is [6-3]/[11-2] = 3/9 = 1/3
slope of the side thru (2,3), (-3,18) is [18-3]/[-3-2] = 15/-5 = -3
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Look at the product of the slopes (1/3)*-3 = -1
Since the product is -1 the sides are perpendicular.
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Cheers,
Stan H.

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