11.4 cm
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A decagon has 10 sides. If each side is 17.2 cm, then the perimeter will be 10 x 17.2 cm Which is 172 cm.
find the perimeter of a decagon if all off the sides equal 4mi.
8 yds * * * * * That is simply nonsense. In a regular decagon, each of the 10 sides is of the same length. So the length of each side is 22/10 = 2.2 feet.
12cm a decagon is 10 sides 120/10=12
Well.... you really wouldn't know unless you found out one side and either multiplied it by ten or, if the sides aren't equal then just add each side.♥