In the videos I’ve worked through some example questions, although you can download the rest of the worksheet & answers:

Download a copy of the question here: QT The Cosine Rule

Here’s a copy of the written answers: QT The Cosine Rule ANSWERS

Here’s the question without the drawing of triangle LMN:

Work out the length LM correct to 3 significant figures.

Here’s the question without the cosine triangle drawing:

Calculate angle ABC

Here’s the question without the drawing:

Work out the area of triangle ABC

Here’s the question:

Two airplanes leave an airport.

Airplane A flies on a bearing of 075⁰ for 600km, and then lands.

Airplane B flies on a bearing of 135⁰ for 450km and then lands.

How far apart are the two aircraft when they land? (4 marks)

These videos are a quick reminder of cosine rule GCSE maths, and are aimed at around grade 7. Questions on the cosine rule appear frequently on GCSE papers, mainly towards Q20 onwards, and are usually calculator.

Cosine Rule questions can be fairly challenging, although once you have practiced, should be straightforward.

Please do

– stop the video

– work through the question

– compare your solution

I hope the videos help and please leave a comment – thanks!

These problems are part of the GCSE maths curriculum, and appear on all the main examination boards such as Edexcel, AQA, OCR and Eduqas.

**Top Tips!**

- Read the question thoroughly
- Work methodically
- Leave plenty of space for calculations 🙂

Here’s other posts that also might be of interest:

How to use a probability tree; GCSE mathematics

Tangent proof; where a line touches a circle

GCSE Mathematics Proof Questions; Answers

How to work with indices; GCSE maths practice questions

Using the Cosine Rule; Grade 6 Maths GCSE Non-Calculator

Parallel or perpendicular lines on a graph; mid-level questions

Edexcel GCSE Maths June 2018 Paper 1

Edexcel Maths Higher Paper 2 November 2018

AQA GCSE Maths Higher 2018; Paper 1

Edexcel GCSE Maths Foundation Paper 2017; Paper 3

Edexcel GCSE maths foundation November 2018 paper 2

Speed Distance Time; mid level GCSE mathematics questions

Please do leave a comment below if you are not sure. Alternately you can view my YouTube channel and leave a comment there – I’ll always try to respond as quickly as possible.

Watch on YouTube:

Cosine Rule 1 – Quick Video GCSE Maths – Grade 7

Cosine Rule 2 – Quick Video GCSE Maths – Grade 7

Cosine Rule 3 – Quick Video GCSE Maths – Grade 7

Cosine Rule 4 – Quick Video GCSE Maths – Grade 7

I’d really appreciate a like, if you found it useful! If you subscribe to the channel, you’ll also be notified of new uploaded videos 🙂

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