A triangle has vertices PPP, QQQ, and RRR. Side PQ PQ\,PQ has a length of 15 cm, and side PR PR\,PR has a length of 22 cm. The angle ∠QPR \angle QPR\,∠QPR is 58∘58^\circ58∘.
Calculate the length of the side QRQRQR.
Give your answer to 3 significant figures.
36 exam-style questions on AQA GCSE Maths The Cosine Rule. Each one has a worked solution and a mark scheme showing where the marks go.