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.
Practise Eduqas GCSE Maths The Cosine Rule with exam-style questions for Foundation and Higher tier. 44 questions, matched to the Eduqas GCSE Maths (C300QS) specification and written in Component 1 and Component 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.