No, it is 3-D.
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A tetrahedron is a kind of pyramid with 4 vertices. A tetrahedron pyramid is probably an object in 4-dimensional hyperspace.
A tetrahedron is 3-dimensional and so it looks just like an ordinary tetrahedron.
A tetrahedron is a 3-dimensional shape - a triangular pyramid. It is NOT a number.
Area is a two-dimensional measurement. It tells you how big a two dimensional object is or how large the surface of a three-dimensional object is.Volume is a three dimensional measurement. It tells you how big the inside of a three-dimensional object is or how much a three-dimensional object can hold inside.
A two-dimensional object is an object that can be drawn on a flat sheet of paper. It's called "two-dimensional" because it has 2 dimensions . . . length and width, but no height.