A sphere !
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An impossibility. An area is a 2-dimensional measure whereas the figure in the question is a 3-dimensional measure of volume. The two are measures of different things and there is no relationship between them.
A tetrahedron is 3-dimensional and so it looks just like an ordinary tetrahedron.
"2-dimensional" means "flat". Anything you can draw on paper is a 2-dimensional shape.
I think it's like lines or something