A 36 m long ladder is placed against a wall. It is inclined at an angle of 60° to the ground. The distance (in m) of the foot of the ladder from the wall is

18\(\sqrt{3}\) 54\(\sqrt{3}\) 18 m  36 m

18 m

cos 60° =  Base : Hyp =     1   :   2  2R = 36 then 1R = 18 m