From the given triangle we get sin 100°/3.5=sin S/2.4. Therefore, option A is the correct answer.
Given that, the law of sin: sin A/a=sin B/b=sin C/c.
We need to find which equation is true for triangle QRS.
How to solve sine rule questions?
In order to use the sine rule, we need to have sides and angles that are opposite each other. If we are finding a missing side then we need to know two angles and one of the sides opposite, we can use this information to find the side that is opposite the other angle.
Now, sine rule for ΔQRS.
sin 100°/3.5=sin S/2.4
Therefore, option A is the correct answer.
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