Posted by Anonymous on Wednesday, July 24, 2013 at 2:44pm.
An observer, whose eyes are 1.87 m above the ground, is standing 27.0 m away from a tree. The ground is level, and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 18.0° above the horizontal. How tall is the tree?

physics  Graham, Wednesday, July 24, 2013 at 4:43pm
1.87m + 27.0m tan(18.0°)
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