William is walking straight across a field towards a vertical flagpole. He observes that when he is at point A, the angle of elevation of T, the top the flagpole is 30degrees and when he is at point B on the same side of the flagpole as A the angle of elevation of T is 45 degrees .The distance between A and B is 20metres .a. Using a scale of 1cm to represent 4m construct a single diagram to relative positions of A, Band T. b. Using a suitable construction on the same diagram of find the height of the flagpole . Pls help me to solve this question