You'll nee Geometry and Trigonometry, try out Q4 from the CIE maths 9709 paper 12 winter 2019, if you get stuck check out the video solution

You'll nee Geometry and Trigonometry

Image of the question can be found here

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If link does not open all CIE exams can be found at

https://pastpapers.co/cie/?dir=A-Level%2FMathematics-9709

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