trigonometry
posted by jen .
A television antenna is on the roof of a building, the angle of elevation of the top and the button of the antenna are 51 degrees and 42 degrees respectively.How tall is the antenna?

trigonometry  more info needed 
drwls
From where is the angle of elevation measured? You need to provide at least one length in order to compute another length.
I assume "button" means "bottom"
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