sine rule
Also called the law of sines. It states that the ratio of the length of a side to the sine of the angle opposite that side is the same for all three sides in any triangle. Using a formula, the sine rule can be written as

symbol spacea / sinA = b / sinB = c / sinC

in which a, b, and c are the three sides and A, B, and C are the three angles opposite a, b, and c.


 
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