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### Geometry Investigation: Complementary and Supplementary

posted Jan 27, 2015, 8:59 AM by mdreyfus@ctkschool.org   [ updated Sep 11, 2016, 3:03 PM by kmcmillan@ctkschool.org ]
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.

Complete the following:

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
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kmcmillan@ctkschool.org,
Jan 27, 2015, 9:00 AM
ċ
Complementary_Supplementary.gsp
(4k)
kmcmillan@ctkschool.org,
Jan 27, 2015, 9:00 AM