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A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.
"triangular" is an adjective, not a noun. So there is no object such as "the triangular". The triangular WHAT?
It is a triangular pyramid.It is a triangular pyramid.It is a triangular pyramid.It is a triangular pyramid.
A triangular pyramid or tetrahedron.A triangular pyramid or tetrahedron.A triangular pyramid or tetrahedron.A triangular pyramid or tetrahedron.
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