The base of the parallelogram, b, can be found by dividing the area by the height. if the area of the parallelogram is represented by 6x2 + x + 3 and the height is 3x, which represents b, the length of the base?

The area of a parallelogram is:
 A = b * h
 Where,
 b: base
 h: height
 Clearing the base we have:
 b = A / h
 Substituting values we have:
 b = (6x2 + x + 3) / 3x
 Rewriting we have:
 b = 2x + 1 / x + 1/3
 
 the length of the base is:
 b = 2x + 1 / x + 1/3

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.