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| Math Central | Quandaries & Queries |
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how many vertices, edges, faces in a triangular pyramid? |
Ally,
A triangular pyramid has a triangular base and one other vertex; it is also known as a "tetrahedron". Each vertex of the base is joined to the top vertex by an edge.
Can you make a model out of (say) plasticine or toothpicks? If not, cut out the diagram below and fold it up into a model. Then count the various bits.
Good Hunting!
RD
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