| Exam Board | OCR MEI |
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| Module | Paper 3 (Paper 3) |
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| Year | 2018 |
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| Session | June |
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| Topic | Trig Proofs |
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15 It is given in lines \(31 - 32\) that the square has the smallest perimeter of all rectangles with the same area. Using this fact, prove by contradiction that among rectangles of a given perimeter, \(4 L\), the square with side \(L\) has the largest area.
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