Question

Can someone help please?
A) 4cm
B) 21cm
C)13.2cm
D)10.7cm

Answer 1

sin θ = $\frac{opp}{hyp}$

If θ = 51° ; opp = QR ; hyp = 17 cm

Then sin 51° = $\frac{QR}{17cm}$

              ⇒  QR  = (sin 51°) (17 cm)
                           = 13.21 cm

           ∴ the answer is OPTION C