To find the perimeter of a regular decagon, multiply the length of one side by the number of sides. It is a simple formula that works for any regular polygon.
The perimeter of a regular decagon is found with this expression:
P = 10 × L
Yes! The formula works for any regular polygon — just change the number of sides. For a pentagon it is P = 5 × L, and for a hexagon it is P = 6 × L.
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