Geometry On the Sphere (Geometry and the Imagination)
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Conway, Doyle, Gilman, Thurston; The Geometry Center  
Great circles on the sphere are the analogs of straight lines in the plane. Such curves are often called geodesics. A spherical triangle is a region of the sphere bounded by three arcs of geodesics... Geometry on the surface of the sphere will come in handy later on for Descartes' angledefect formula.  


Levels:  Elementary, Middle School (68), High School (912) 
Languages:  English 
Resource Types:  Lesson Plans and Activities 
Math Topics:  Elliptic & Spherical Geometry 
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