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Dandelin Spheres

Stan Izen 

August 2006, Volume 100, Issue 1, Page 20

Abstract:
This article describes a development of conic surfaces that connects different definitions of the conics. A classroom project using Dandelin Spheres is also described.

Keywords:
Article
Algebra
Conceptual Development
Grades 9-12
Teacher
Lesson Plans
Problem Solving / Problem Posing
Reasoning and Proof