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Using this virtual manipulative, the student can see the effect of intersecting a plane with a platonic solid, each a polyhedron with identical regular polygonal faces. The manipulative's screen contains two viewing windows: the left window showing where the intersection occurred and the right showing the cross section of the solid resulting from the intersection. By turning off the Show Entire Solid command, only the portion of the shape above or below the cut is visible in the left screen. Instructions for using the applet and useful class questions about intersections and faces are included. There is also a link to the NCTM standard for geometry. Copyright 2005 Eisenhower National Clearinghouse
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