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Read the Fine Print
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(Complete Item Description)
- Abstract:
An interactive applet and associated web page that demonstrate the concept of a concave polygon - one where at least one interior angle is greater than 180 degrees. The applet shows an irregular polygon initially with one interior angle greater than 180 degrees. The user can drag any vertex and change the number of sides in the range 3..99. When the polygon is concave, the angles that make it so are drawn in red. The goal is to show through experimentation what the concept of concavity really means. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.
- Subject:
- Mathematics and Statistics
- Grade Level:
- Secondary
- Collection:
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Math Open Reference
Read the Fine Print
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(Complete Item Description)
- Abstract:
In this interactive activity featuring videos adapted from the Rutgers PAER Group, observe how light bends when it travels through a convex lens, a concave lens, and glass.
- Subject:
- Science and Technology
- Grade Level:
- Primary, Secondary
- Collection:
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Teachers' Domain
No Strings Attached
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