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pyramid (not including the vertex) Prism
A pyramid could be constructed from 4 or more triangles.
It depends on the shape. The number of edges, alone, is not enough to determine a unique shape.
A straight line.A straight line.A straight line.A straight line.
Any triangular structure. The triangle is used in building structures like towers and bridges because the three sides of a triangle, when locked together at their ends, are very strong and do not change shape. It's one of the most important shape in constructions. The circle is another important shape too.