An angle of 43 degrees cannot be a vertical angle. A vertical angle, by definition, is 90 degrees
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43
90 - 43 = 47 degrees.
A line that is at right angles to a vertical line is said to be horizontal.
In a triangle a/SinA = b/SinB = c/SinC Since angle A = 43 and angle C is 72, angle B = (180) - (72 + 43) = 65 Hence 20/Sin65 = c/Sin72 20/0.9063 = c/0.9510 c = (20 x 0.9510)/0.9063 = 20.9864
Complimentary angles