A regular decagon is a polygon with 10 sides and the lengths of all the 10 sides are equal. … The PERIMETER of a polygon is equal to the sum of the lengths of all its sides. Therefore, the PERIMETER of the given regular decagon is given by. Thus, the required perimeter of the given regular decagon is 10l.

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Answer:A regular decagon is a polygon with 10 sides and the lengths of all the 10 sides are equal. … The PERIMETER of a polygon is equal to the sum of the lengths of all its sides. Therefore, the PERIMETER of the given regular decagon is given by. Thus, the required perimeter of the given regular decagon is 10l.