Solve question 8:

8. The angle of elevation of the top of a vertical tower from a point A. due east of it is 45o. The angle of elevation of the top of the same tower from a point B, due south ofA is 30o. If the distance between A and B is 54  2 m . then the length of the tower (in metres) is: 

A   54                         B   108                       C   54 3                           D   36 3

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