Experiment #1 Cones & Angles

Make two paper cones that are exactly the same size, tape the tips of the cones together exactly opposite each other, flatten the cones, and trace along their edges. Use the figure to explore the relationships of the angles.

Experiment #2 The Mobius Strip (Continuous Lines)

• Cutting a Mobius Strip
  • "How Math Works", Carol Vorderman, Reader's Digest P. 165
• Recreations: The Mobius Strip
  • "Mathematics though Paper Folding", Alton Olsen, NCTM, P. 37

Experiment #3 Paper Folding (Parallel Lines, Right Angles)

• Labratory Activity: Creating a Right Angle
  • "A Problem Solving Approach to Mathematics", Billstein, P. 553
• Paper Folding Parallel and Perpendicular Lines
  • "Discovering Geometry: An Inductive Approach" Serra, P. 150

Experiment #4 Using String to Create A Right Angle

• A 3-4-5 Triangle
  • "How Math Works", Carol Vorderman, Reader's Digest P. 124

Experiment #5 Using A Clock to Tell Right Angles.

If it three o'clock, when is the next time that a right angle is formed? What are the times when a right angle is formed? Is 3:30 a right angle? How about 12:17? .....