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5 (penta = 5, hexa = 6, hepta = 7, octo = 8...)
Hepta is a prefix. It means 7. A heptagon is a 7 sided polygon.(7 sided shape) 6 7
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Pentagon is 5 sided. From Latin the names ore Tri = 3 ( As trigon / triangle) Quad = 4 Penta = 5 Hexa = 6 Hepta = 7 Octa = 8 Nona = 9 Decs = 10 Centa = 100 ( AS centagon - 100sides). Kilo = 1000
It comes from Classical Greece. '--gon' is a 2-dimensional figure. tri = 3 ( As in triangle; 'trigon') tetra = 4 penta = 5 hexa = 6 hepta = 7 octa = 8 nona = 9 deca = 10 To give the first '10' names.