Sine Law There are two main relationships in any triangle that can help find a missing angle or side length. The first one we will look at is Sine Law. Sine Law The idea of the sine law is that the ratios of the side lengths in a triangle are equal to the sine of its opposite angle. This can be expressed as: or This law is useful if you know: ● Two sides and an angle opposite one of those sides (SSA) ● Two angles and any side (AAS or ASA) Solving To Find an Unknown Side Length Solving to Find an Unknown Angle Word Problems
