Using suitable variable, write the formulae for the following:
Perimeter of a regular decagon

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Solution

Let each side of the decagon is $a u n i t$
A decagon has $10$ sides.
perimeter $= s u m o f a l l s i d e s = 10 a u n i t$
Hence, the perimeter of a regular decagon is $10 a u n i t$ .

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