its a triangle if u take away the 3d part of it it ends up as a triangle. (sorry if I'm wrong just a young boy)
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2D - the triangle 3D - the tetrahedron (i.e. it has a triangle on each side and there are 4 sides.
this is the shape of 2d cone
It's a 2D shape.
Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
it a triangle as a 2d shape