Final answer:
The Law of Sines (option A) is used to find the sides of a triangle with 3 angles.
Step-by-step explanation:
The correct option for finding the sides of a triangle with 3 angles is Law of Sines (option A).
The Law of Sines relates the ratios of the sides of a triangle to the sines of its angles: a/sinA = b/sinB = c/sinC.
By using this formula, you can find the lengths of the sides of a triangle when you know the measures of the angles and either the length of one side and its opposite angle or the lengths of two sides and the angle between them.