24. If r1 and r2 are the position vectors (both lie in xy plane) making angles θ1 and θ2 with the position x-axis measured counterclockwise, find their vector product when:
(i) r1 = 4cm with θ1 = 30° r2 = 3cm with θ2 = 90°
(ii) r1 = 6cm with θ1 = 220° r2 = 3cm with θ2 = 40°
(iii) r1 = 10cm with θ1 = 20° r2 = 9cm with θ2 = 110°
