Polyhedra Perspective Problems

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In 2D engineering drawings, a single view does not show all the features of an object, so several views are used. Some objects are perplexing even when three views are shown:


This Demonstration provides various spatial problems for polyhedra with 2D views. Red faces are only on visible parts (from these view points) of a polyhedron and all unseen faces are cyan. Determine the number of red faces in each problem.


Contributed by: Izidor Hafner (February 2012)
Open content licensed under CC BY-NC-SA




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