Question

When to use cosine formula and when to use sine formula in triangle

Answer 1

Answer:

To solve a triangle is to find the lengths of each of its sides and all its angles. The sine rule is used when we are given either a) two angles and one side, or b) two sides and a non-included angle. The cosine rule is used when we are given either a) three sides or b) two sides and the included angle.

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Answer 2

As sin theta = P/H

and cos theta= B/H

So whenever you are given perpendicular and hypotenuse, use sin and when u r given base and hypotenuse use cos.

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