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9. Determine R in the triangle helnw:

9. Determine R in the triangle helnw:-example-1

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In the figure, angle B is 92 deg 57'

How to solve for angle B

Angle B in the figure is solved using the concept of sine rule

Applying sine rule we have the proportion

Sine A / 13.375 = sine 27deg 10' / 7.060

sine A = 13.375 * 7.060 / sine 27 deg 10'

sine A = 0.86498

A = arcsin (0.86498) = 59.88

angle A + angle B + angle C = 180 (sum of angles of a triangle)

59.88 + angle B + 27 deg 10' = 180

angle B = 180 - 27 deg 10' - 59.88

angle B = 92 deg 57'

User Serdar Dalgic
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