a triangular base pyramid
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5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
A cube has 4 flat surfaces (called faces) and 6 vertices (or corners).
A triangular based pyramid has 4 flat faces, 6 edges and 4 vertices.
A pyramid has 4 flat faces, all of which are triangular. Don't confuse this with a square-based pyramid like those in Egypt, as they have 5 faces.
There cannot be a solid three sided figure. A solid 4 sided object is a tetrahedron.