What is the minimum information needed in order to use the Law of sines?


Step 1
1 of 2

The equation

asinA=bsinB\frac{a}{\sin A} = \frac{b}{\sin B}

relates two sides of a triangle and two angles opposite those sides. Thus, we need three pieces of information to find the fourth: either two sides and the angle opposite one of them, or two angles and the side opposite one of them.

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