Trigonometry, SMB-064 Find the value of \(d\), correct to 2 decimal places. (3 marks) Show Answers Only \(d=12.9\ \text{km}\) Show Worked Solution \(a^2\) \(=b^2+c^2-2bc\ \cos A \) \(d^2\) \(= 8.9^2+5.2^2-2 \times 8.9 \times 5.2 \times \cos 130^{\circ}\) \(= 165.746…\) \(\therefore d\) \(=12.87…\) \(=12.9\ \text{km (1 d.p.)} \)
