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