In triangle $PQR$, $PQ=11$ cm, $PR=12$ cm and $\angle QPR=56^\circ$. Calculate $QR$, givin

Question

In triangle $PQR$, $PQ=11$ cm, $PR=12$ cm and $\angle QPR=56^\circ$. Calculate $QR$, giving your answer correct to 3 significant figures.

Accepted Answer

$10.834$ cm.

Sec 3/4 E Math T06-Q09 - Applying the cosine rule