2. D Not to scale 270 B Figure 1 Figure 1 shows the design for a structure used to support a roof. The structure consists of four steel beams, AB, BD, BC and AD. Given AB = 12m, BC = BD = 7m and angle BAC = 270 (a) find, to one decimal place, the size of angle ACB. (3) The steel beams can only be bought in whole metre lengths. (b) Find the minimum length of steel that needs to be bought to make the complete structure. (3) Compiled by: EBX