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WHAT IS IT?
Descartes' Circle Theorem involves relationships among radii of tangent circles, "packed" together. The relationship is expressed using the curvature of each circle, which is also the reciprocal of the radius involved.
GRADE LEVEL/STRAND
The lesson is designed for high school geometry students who have studied tangent circles.
CLASS TIME
The lesson is designed to be done outside of class as a directed investigation.
MATERIALS
No materials are required but the investigation can be done with the help of The Geometer's Sketchpad®.
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