10*length of a side.
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130 What! How about one tenth of its perimeter?
It is: 58/10 = 5.8 units of length
Regular = all sides equal so all sides of 25 cm. Decagon = 10 sides. So perimeter = 10*25cm = 250 cm.
measure the perimeter then measure from the EXACT center to a side multiply this only works on regular decagons!
The formula for the perimeter of ANY regular pentagon isPerimeter = 5 x (length of one side)