In triangle PQR, PQ = 15 cm, PR = 10 cm and angle PQR = 40 degrees

i) Show that sin R = 0.9642 to 4 d.p.

ii) Illustrate on a sketch the two possible configurations of triangle PQR.

iii) Find the area of the smaller triangle PQR.

I seriously dont even know how to do (i)!

Can anyone please help me?