wouldn't it just be 2cm times 10 so the answer is20cm
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A decagon has 10 equal sides, so if the perimeter is 120 cm each side must be 12 cm
170 cm
Regular = all sides equal so all sides of 25 cm. Decagon = 10 sides. So perimeter = 10*25cm = 250 cm.
The answer is 12 cm.
The perimeter is 20*sqrt(2) cm = 28.2843 cm