MPM2D1-01 Finding altitudes 2016-10-05


We wrapped up your area work (on the chart paper), and then learned to find an altitude given the coordinates of the vertices of a triangle.

If you have triangle ABC with base AB , the altitude from C can be found using the following steps:

  • Find the slope of AB
  • Find the slope of the altitude (negative reciprocal of the slope of AB since it’s perpendicular)
  • Find the equation of the line through AB
  • Find the equation of the altitude line

In the example we did today we also found the point D which was the intersection of the altitude with the base. For that we needed to solve the system of equations for those two lines.

Here are some helpful videos:

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