the diagram shows a sector of a circle with centre o. the radius of the circle is 8 cm. the point p on oa is such that 2op=3qr and the point q on ob is such that 4oq=3qb. given that angle aob =0.8 radians. calculate giving your answer correct to 2 decimal places. a)the length of the arc ab. b)the length of the line pq. c)the area of the shaded region