1. You are standing nearby a tree with your eyes 2 metres above the ground. The line of sight to the top of the tree makes an angle of 60° with the horizontal. This angle reduces to 45° when you step back 4 metres further away from the tree, (a) How tall is the tree? (b) Suppose that you then step back another 2 metres further away from the tree. What angle does the line of sight to the top of the tree now make with the horizontal?

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