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A triangular pyramid. This is one where all the faces are triangles - a three-sided base, from which three triangular faces rise to a single point - the apex.
A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.
A three-dimensional figure with 30 faces is called a triacontahedron.
surface area
One - a rectangle is a flat shape - not a three dimensional object !