3 A light, L, is fixed on a building 8 m above the base, B, of the building. (a) A point, P, is on the horizontal ground 12 m from B. Calculate the angle of elevation of L from P. (b) A ladder is placed on the ground at Q to reach the light, L. The ladder makes an angle of 70° with the ground. Calculate QL. (c) A vertical pole, RS, of length 1.6 m is placed touching the horizontal ground. The light produces a shadow, TS, of the pole on the horizontal ground. LRT is a straight line and TB = 6.5 m. Calculate TS.