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A pentagon has 5 sides. Think about the root words that go into the names that shapes have:

Triangle breaks into "Tri" and "angle" meaning, three angles

Quadrilateral, into quad and lateral, meaning 4 sides

"gon" also means side, and the greek words that go along with it are as follows:

tri - 3

tetra - 4

penta - 5

hexa - 6

hepta - 7

octa - 8

nona - 9

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16y ago

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