| Exam Board | OCR MEI |
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| Module | Paper 3 (Paper 3) |
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| Year | 2021 |
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| Session | November |
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| Topic | Sine and Cosine Rules |
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11 In this question you must show detailed reasoning.
The diagram shows triangle ABC , with \(\mathrm { BC } = 8 \mathrm {~cm}\) and angle \(\mathrm { BAC } = 45 ^ { \circ }\).
The point D on AC is such that \(\mathrm { DC } = 5 \mathrm {~cm}\) and \(\mathrm { BD } = 7 \mathrm {~cm}\).
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Determine the exact length of AB .