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Tool: A Plethora of Polyhedra
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Description: This is a free JAVA applet that helps users to study spatial geometry in a dynamic and interactive way. Using it, the user can rotate, zoom out, zoom in and translate a plethora of polyhedra. Moreover, the program is able to compute topological and geometrical duals of each polyhedron. Geometrical operations include unfolding, plane sections, truncation and stellation.
Technology Type: Java Applet 
Author: Humberto Jose Bortolossi
Language: English 
Cost: Does not require payment for use

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Courses: Math 2 Geometry in space
Math 3 Geometry in space
Math 4 Geometry in space
Math 5 Geometry in space
Math 6 Geometry in space
Math 7 Polyhedra, Platonic solids, Archemedian solids, Prisms, Euler's formula, 2-D nets -> 3-D figures
Geometry Pyramids, Prisms, Surface area, Volume, Regular polyhedra, 2D pictures of 3D solids, Transformations and symmetry

Teacher Review (Based on classroom experience)
Reviewer: Jethro, Feb 21 2010 10:35:42:060PM
What did students learn? Students learned the relationship between 3-D objects and the 2-D nets that create them. Specifically, as an intro to nets, they learned about the Platonic solids as an enrichment before learning about general nets.
Recommended for: Math 7: Geometry in the plane, Geometry in space
Geometry: Perpendicular and parallel lines, Polygons, Perimeter, area, and volume
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Comment:Very professional & FREE! Great resource on polyhedron - program can easily be used by novice as well as an individual with a deeper backgeound.