5 (a) OAB is a sector of a circle, centre O, radius 11 cm. AOtB = 134°. (i) Calculate the length of the arc AB. (ii) Calculate the shortest distance from O to the line AB. (b) [Volume of a cone = 1/3 πr^3] [Curved surface area of a cone = πrl] A cone has height 9.5 cm and volume 115 cm^3. (i) Show that the radius of the base of the cone is 3.4 cm, correct to 1 decimal place. (ii) Calculate the curved surface area of the cone.