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2 items are filed under this topic.
Triangular prisms and pyramids 2009-01-10
From KJ:
What are some items found in a home or school that could be considered a triangular prism or triangular pyramid?
Answered by Robert Dawson and Penny Nom.
Three Spheres 1997-01-14
From Alan Schnerch:
Three spheres of diameter 2 are placed on a level surface so that each sphere touches the other two. A fourth sphere, also of diameter 2, is placed on top of the other three so that it touches all of the other spheres. The distance from the level surface to the highest point of the top sphere is . . ..
Answered by Chris Fisher and Harley Weston.



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