| Exam Board | AQA |
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| Module | Further AS Paper 1 (Further AS Paper 1) |
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| Year | 2020 |
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| Session | June |
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| Marks | 4 |
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| Topic | Polar coordinates |
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17 The polar equation of the circle \(C\) is
$$r = a ( \cos \theta + \sin \theta )$$
Find, in terms of \(a\), the radius of \(C\).
Fully justify your answer.
\(\_\_\_\_\) [4 marks]