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(3376)   (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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