Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 2 - No. 41)
When using the Law of Cosines, what information is typically needed?
Two sides and the included angle
Two angles and any side
All three sides
All three angles
Explanation
The law of cosines is used when given two sides and the included angle, or when you are given all three sides.