Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 5 - No. 27)
Which of the following scenarios is best suited to applying the Cosine Rule directly?
You have two sides and an included angle.
You have all three angles and one side.
You have two sides and one non-included angle.
You have all three sides.
Explicación
Knowing all three sides means you can find any angle