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a triangle-3

a quadrilateral or square-4

a pentagon-5

a hexagon-6

a heptagon-7

a octagon-8

a nonagon or ennagon-9

a decagon-10

a hendecagon or undecagon-11

a dodecagon-12

a triskaidecagon-13

a tetrakaidecagon-14

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15y ago

What else can I help you with?