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Geometry Investigation: Complementary and Supplementary

posted Jan 27, 2015, 8:59 AM by Michael Dreyfus-Pai   [ updated Sep 11, 2016, 3:03 PM by Karen McMillan ]
Today we're going to launch into a series of dynamic geometry activities. By using tools that reflect the underlying concepts of geometric figures, we'll develop a deeper understanding.

Geometer's Sketchpad Refresher

Complete the following:

  1. Launch Geometer's Sketchpad (GSP5)
  2. Draw a point, line, ray, and line segment
  3. Construct an angle and measure that angle.

Things to notice:

  • Notice how GSP simulates points, lines, rays, and segments
  • Pay careful attention to how angles are named. The order of points listed describes where the vertex and legs of the angle are
  • Notice how GSP will always measure the convex angle (less than 180º)

Investigation: Complementary and Supplementary Angles

Download the GSP file here. Using the included sketch, identify pairs of angles that are...

  • Complementary: they add up to 90º
  • Supplementary: they add up to 180º
Karen McMillan,
Jan 27, 2015, 9:00 AM
Karen McMillan,
Jan 27, 2015, 9:00 AM