Law of sines and cosines relate side with sine and cosine of an angle opposite the side in triangle. By sine law, ratios of side to sine of angle are equal.
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Laws of sines
Hope that you have already tried to solve the corresponding 10 SSC CGL Tier II level questions that had quite a variety and depth (area of a triangle, laws of sines, similar triangles, trapezium, cyclic quadrilateral, circles and more). And these detailed solutions of the questions should give you a clear idea on how to solve the questions easily and quickly...