Gradients of Perpendicular Lines

  • Draw a line through points A and B.
  • Draw a line perpendicular to the first line through the point A.
  • Use the IconSlope tool on both lines.
  • Rename the gradients to m1 and m2 respectively.
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  • Make a new variable as in the picture below. Move the points!
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  • Make a conjecture! Prove it!

Hint: Look at the picture and use similar triangle.

by Malin Christersson under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 Sweden License