3.1

In the diagram below, B is the foot of a multi-storey building. Three people D, E and C, are

standing at the windows on three different floors. They are all looking at object A on the

ground, which is in the same horizontal plane as B.

AC = 9 units, BC = 5 units and A₁ = A₂ = A3

Calculate, correct to two decimal places the:

3.3.1

Size of CÂB

C

E

D

B

Ground level

(2)