SOLUTION: Floor plans for a building have the four corners of a room located at the points (2,3), (11,6), (-3,18), and (8,21). Determine whether the side through the points (2,3) and (11,6)

Question 106084: Floor plans for a building have the four corners of a room located at the 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 MathLover1(20850) (Show Source): You can put this solution on YOUR website!
1. the side through the points (,) and (,)
Find a slope :

= ( �)/( � )

2.
the side through the points (,) and (,)
Find a slope :

= ( �)/( � )

If the product of slopes is equal to , lines are .
We have and ,
so

............. => your lines are

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