A three dimensional triangular figure with three faces and a base is called a triangular pyramid. It has four vertices, four faces, and six edges.
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Tetrahedron
No. A triangle is a 2-dimensional figure, a prism is 3-dimensional.
NO!!! A triangle is a 2-dimensional shape of three sides; archaically a 'trigon'. A polyhedron is a 3-dimensional solid of many sides.
An isometric triangle is a 3 dimensional triangle shown on a flat surface or in 2 dimensions.
A three-sided, two-dimensional polygon is called a "triangle".