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At an instant the shadow of a flag-staff is three times as long as its shadow,when the sun-rays make an angle of 60 degree with the ground.Find the angle

between the sun-rays and the ground at this instant.



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 let the shadow be x , then we have flag post is 3x and angle is Ф
 from trigonometry we have tanФ= 3x/x= 3
                                             Ф= 71.5
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