The diagram shows a quadrilateral $$\(P Q R S\)$$ formed from two triangles, $$\(P Q S\)$$ and $$\(Q R S\)$$. Calculate $$\(Q R\)$$, $$\[ Q R= ........................................ \mathrm{cm} \]$$
Exam No：0580_m20_qp_42 Year：2020 Question No：8(a)(i)
Answer:
\(2.67\) or \(2.666 \ldots\)
Knowledge points:
E6.4 Solve problems using sine and cosine rules and the area formula for triangles.
Solution:
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