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To find perimeter of a polygon, simply find a way to know the measurement of it's sides.
Since you said that the side = 13cm
and it seems that it's equilateral...
simply multiply it by 3
So... 13×3=39
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Hence, the statement only gives out a single measure of the side where it is equal to 13 cm. then, the given triangle is an equilateral triangle.

P = 3s

Where s= 13cm

P = 3 (13 cm.)

P = 39 cm.

Therefore, the perimeter of the given equation is equal to 36 cm.

Hope it Helps =)

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