Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 1 - No. 8)
What information do you need to use the cosine rule to find the length of a side?
Two sides and one non-included angle.
All three sides.
Two sides and the included angle.
Two angles and one side.
Giải thích
The Cosine Rule requires two sides and the included angle to solve for a side.