.π/75 B.75/π C.5π/12 D.12π/5 E.π/30 3.An arc PQ subtends an angle 60° at the centre O of radius 3 cm. The area of the sector POQ is A. 270 〖cm〗^2 B. 3/2 〖cm〗^2 C. 3π/2 〖cm〗^2 D. 3π 〖cm〗^2 E. 180 〖cm〗^2