Octahedron.
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A pentagonal shape has 5 faces. For determining the name of a shape, it is determined by the amount of faces. For determining the amount of faces on a shape, it is determined by the pre fix of a word. tri-3 quad-4 pent-5. hex-6 hept-7 oct-8 non-9 deca-10 and so on.
hexagonal
A decahedron.
A 10-sided die has 10 triangular faces.
decahedron