Posted by Winsel on Saturday, August 14, 2010 at 1:30am.
I will help you with the diagram, after that it is easy.
Draw a vertical line AB, the tower, where A is the position of the man and B is the base of the tower.
AB = 73.5
Draw another vertical line CD, for the tree, C as the top and D as the bottom
Mark E on CD as the same height as AB
clearly AE = BD
and ED = AB , all we need is CE
angle (CAE) = 12.66667°
angle(EAD) = 70.3333° making angle (BAD) = 19.66667°
You now have 2 nice right-angled triangles, where you can find BD, and its an easy ride after that
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