Posted by kevin spence on Friday, May 20, 2011 at 11:03am.
from the top of a tower, the angle of depression of a boat is 30 degree. if the tower is 20 meter high, how far is the boat from the foot of the tower?

math  Damon, Friday, May 20, 2011 at 11:06am
sin30/20 = sin60/x
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