Supplementary Investigation 27

3-D Tetrahedron

Tool(s) Geometers Sketchpad

Data File(s) si27

Focus A dynamic, 2-point perspective representation of a tetrahedron.

Tasks

1. Color and shade the faces of the tetrahedron to better reveal its features.

2. Drag point A above the Horizon Line. Describe the apparent effect on the shape and position of the tetrahedron. On what you can see of the object.

3. Modify si27 to create a 3-D perspective drawing of an object other than a cube or a tetrahedron.

COPYRIGHT ã 2002 by Brooks/Cole Publishing Company A division of International Thompson Publishing, Inc.