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Artie's dad's house is 21 ft tall. If Artie's dad is at the top of the house installing shingles, and his son Artie is on the ground 12 ft away from the base of his dad's house, what is the angle of depression from the top of the house to the spot where Artie is standing?  Answer to two decimal places.

 Jan 20, 2020
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arc tan (21/12) =

 Jan 20, 2020

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