The accompanying figure shows a surveyor collecting GIS data at point B on top of a building AB that is 50m high. He observes two potential streetlight locations C and D. The angle of elevation of B from D is 55 and the angle of elevation of B from C is 48.11 a=5242 50m DB=55 y=4811' C 3.1 Calculate the length of BD and BC (6) 3.2 Calculate the distance between the two streetlight locations C and D 3.3 Calculate the area of ABCD (4) (4)