Let the Study Guides explain when, and how, to use the Cosine Rule on triangles. See below ...

Covers the whole of the National 5 Maths course

Created by an experienced maths teacher

Resources used with students studying Maths in Scottish Secondary Schools

Understanding the Cosine Rule important to ensure your success in assessments, tests and exams.

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Exam Ques 1 (GCSE) | Cosine & Sine Rules |

Exam Ques 2 (N5) | Cosine & Sine Rules |

Exam Ques 3 (N5) | Cosine & Sine Rules |

Exam Ques 4 (N5) | Cosine & Sine Rules |

Theory Guide | Cosine Rule - Theory Guide |

Theory Guide | Sine Rule - Theory Guide |

Worksheet | Sine & Cosine Rules |

PowerPoint | Cosine & Sine Rules |

Easy to understand Theory Guides below:

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**The Cosine Rule **can be used on any triangle for finding lengths and angles. Consider the triangle below.

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For triangles with two lengths and an angle in-between, the third length can be found using the cosine formula for finding length.

. a² = b² + c² – 2bccosA

For triangles with three lengths, any of the three angles can be found using the cosine formula for finding angles.

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You need to know how to label the sides of the triangle and what to substitute into the formula.

We cover everything you need to know about the Sine & Cosine Rules in the Study Guides. See further examples HERE.

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to study the Cosine Rule

Past/Practice Exam Papers, Theory Guides, Worksheets, Starter Questions, Mind Maps, PowerPoints, Videos, Exam Focused Study Pack ...

Past/Practice Exam Papers, Theory Guides, Text Book Solutions, Starter Questions, Mind Maps, Videos, Exam Focused Study Pack ...

Past/Practice Exam Papers, Theory Guides, Text Book Solutions, Starter Questions, Mind Maps, Videos, Exam Focused Study Pack ...

Past/Practice Exam Papers, Theory Guides, Mind Maps, PowerPoints, Videos ...

Past/Practice Exam Papers, Mind Maps, PowerPoints, Videos, Exam Focused Study Pack ...

Primary, S1-S2, N3, N4, N5, GCSE, Higher, AH Maths, AH Statistics & AH Maths of Mechanics ...

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