This 3D shape could be a square based pyramid.
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The shape you are referring to is a tetrahedron. A tetrahedron is a polyhedron with four triangular faces and four vertices. It is a three-dimensional shape with a triangular base and three triangular faces meeting at each vertex. The tetrahedron is a type of pyramid, specifically a triangular pyramid.
A cone or a bulged-out cone.
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sqare based pyramid
a BIG HUGE triangle i am in the 2ndgrade and i am 8 i am in glenarnden woods elem. in pgcps
A square has 1 face