Perimeter of parallelogram = 2×(sum of two adjacent sides)
Let the adjacent sides be a and b.
So, A/Q⇒ 2×(a+b)=36
(a+b)=18..............[36 canceled out by 2]
→it is given that all opposite and adjacent sides are equal.
So, 2a=18..........(adjacent sides are equal)
We know that the area of ||gm= a×h
Here h representing altitude.
Altitude of ||gm is 10 cm.