Which angle must be known to find a missing side using the Cosine Rule?
The exterior angle (the angle outside the triangle).
The included angle (the angle between the two known sides).
The opposite angle (the angle opposite one of the known sides).
A non-included angle (an angle not between the two known sides).
Flashcards for Eduqas GCSE Maths The Cosine Rule, covering the key formulae, methods and definitions you need to recall for Component 1 and Component 2. 22 cards, matched to the Eduqas GCSE Maths (C300QS) specification.
