A 15-agon (really.)
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NOT REALLY because the "-agon" suffix is applied to 2-dimensional objects. For 3-dimensional objects, the suffix is "-hedron" so the correct ansver could be 15-hedron, but certainlyy NOT 15-agon.
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It is a pentagonal prism.
3d shape Well actually it is a Cube
a sphere
A 3D shape with all triangular faces can be a tetrahedron pyramid.
hexagonal