Job Recruitment Website - Zhaopincom - (Subject 16) As shown in the figure, someone looked up at an iron tower on the top of the hill opposite the slope P, with the tower height AB = 80m, the tower height OA = 220m, OC.
(Subject 16) As shown in the figure, someone looked up at an iron tower on the top of the hill opposite the slope P, with the tower height AB = 80m, the tower height OA = 220m, OC.
( 1) (2)P(320，60)
( 1)CD: (2 ')
(2) Note that P, ∵, ∴∠APB are all acute angles.
tan∠APB= (4 ')
= ( 10')
( 14')
When is the equal sign? Get it on time
∴ When the observer is located at P (320 320,60), the maximum viewing angle is (16').
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