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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.

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14y ago

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