This GCSE tutorial on the cosine rule teaches how to use the rule to find missing angles and missing sides. The cosine rule is used in non-right-angled triangles and in situations where we have a side-angle-side set-up. We look at several worked examples including a question using bearings.
#cosinelaw #gcse #maths
Sine rule video: https://youtu.be/PbblVPBbtMM
Introduction 00:00
The 2 versions of the cosine rule 00:13
How to find a missing side 02:30
How to find a missing angle 05:14
Example 1 07:11
Example 2 part a) 10:25
Example 2 part b) 12:44
