There are 18 pupils in a queue. If the distance between two pupils is 80 cm, how long is the queue?
(a) 1063 cm
(b) 1036 cm
(c) 1630 cm
(d) 1360 cm
Circles with centre P, Q and R are shown in the figure. The diameter of circle with centre R is 22 cm. What is the length of PR ?