No. Adjacent sides, yes. (Twice the sum)
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The sides are 24 metres and 36 metres.
It's not a matter of 'finding' it. Either the quadrilateral is a parallelogram,or else it is not one.If the opposite sides of the quadrilateral are parallel, then it's a parallelogram.
Add up the lengths of all the sides. (Same for any shape [except a circle])
perimeter of a parallelogram = 2(w+h) where:w is the base length of the parallelogramh is the side lengthIf you know the length of one side, then the opposite side must have the same length.This is not enough information to fine the perimeter since you have only h or w and not both.
Add together the lengths of all four sides of the parallelogram, or,add together the lengths of a pair of adjacent sides and then double the result.