A window in the shape of a parallelogram has the dimensions given.
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We know that According to Law of Sines :
where A - B - C are the Angles of the Three Vertices of the Triangle
a - b - c are the lengths of the Opposite sides of the Angles of the Respective Vertices A - B - C
From the Given Triangle we Can Notice that :
SinC = 0.682
C = 43°