Revise trigonometric ratios of sine, cosine and tangent and calculate angles in right-angled triangles with this Bitesize GCSE Maths Edexcel guide. |
The cosine rule, also known as the law of cosines, relates all 3 sides of a triangle with an angle of a triangle. It is most useful for solving for missing ... |
Revise how to use the sine and cosine rules to find missing angles and sides of triangles as part of National 5 Maths. |
The cosine rule is used when we are given either a) three sides or b) two sides and the included angle. 1. The sine rule. Study the triangle ABC shown below. |
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