## Exam-Style Question on Trigonometry## A mathematics exam-style question with a worked solution that can be revealed gradually |

Question id: 75. This question is similar to one that appeared on an IB Standard paper in 2014. The use of a calculator is allowed.

In triangle ABC, AB = 7cm and AC = 9cm. The area of the triangle is 20cm^{2}.

(a) Find the two possible values for the angle A.

(b) Given that A is obtuse, find the length of the side BC.

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