There are three sides to a triangle.
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Three EdgesA triangle has three edges.
There are twp perpendicular edges in a triangular prism. See if you draw a triangle you'll have two angles or edges that are the same length. That is if you draw a standard triangle.
There are many possible solids. A triangle based prism, or a triangle based dipyramid are two examples.
A triangular-based pyramid has six edges: three in the base triangle and three from there to the apex.
A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges. 6 edges