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A dodecagon has 12 sides
12 points * * * * * A decagon has 10 vertices (points) and 10 sides. A polygon with 12 is a dodecagon.
a 12 sided polygon!:) * * * * * Oh dear! A 12 sided polygon is a dodecagon, not a decagon. The correct answer is 10 sides.
A decagon has 10 equal sides, so if the perimeter is 120 cm each side must be 12 cm