From her elevated observation post 300 m away, a naturalist spots a troop of baboons high up in a tree. Using the small transit attached to her telescope, she fi nds the angle of depression to the bottom of this tree is 30?, while the angle of elevation to the top of the tree is 60?. The angle of elevation to the troop of baboons is 45?. Use this information to fi nd (a) the height of the observation post, (b) the height of the baboons? tree, and (c) the height of the baboons above ground.