Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 3 - No. 48)
In a triangle, which of the following scenarios allows you to directly apply the cosine rule?
Knowing two sides and the included angle.
Knowing all three sides.
Knowing two angles and one side.
Knowing two sides and one non-included angle.
Explicaţie
The cosine rule works if you have SAS or SSS.