You cannot. A parallelogram can be flexed: the angles can be altered without affecting the lengths of the sides.
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You do not need to find. If it is a parallelogram, it must be 180 degrees.
If a parallelogram has adjacent sides of length a and b and the angle between then is x, thenarea = a*b*sin(x).
They are 12.59 and 5.34 units respectively.
The sides are 24 metres and 36 metres.
If you have the lengths of the two sides and a diagonal, then you can use Heron's formula to find the area of one triangle and double it for the area of the parallelogram.If you have two sides and an angle, then area = a*b*sin(C).