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A man observe that when he has walked c metres up an inclination the angular depression of an object in a horizontal plan through the foot of the slope is (alfa) and also observed that when he has walked a further discance of c metres up the slope, the depression is (Beta). prove that the inclination of the slope to the horizontal is Cot -1 (2 Cot Beta – Cot alfa) a field is in the shape of parabola bounded by a strate side of length 40 metres. C is the vertx of the parabola and it is equidestance from the two ends A and B of the straight side. A verticle pillar PQ stands at the middle point Q of the straight side. If the angle of elevation of the top of the piller from A and C be respectively (alfa) and (beta) then find the angle of elevation of the piller from the point D on the curved boundary such that angle DQA = 45 0 . Also find the distance of the pillar from the vertex.

  1. A man observe that when he has walked c metres up an inclination the angular depression of an object in a horizontal plan through the foot of the slope is (alfa) and also observed that when he has walked a further discance of c metres up the slope, the depression is (Beta). prove that the inclination of the slope to the horizontal is 
Cot -1 (2 Cot Beta – Cot alfa)
 
  1. a field is in the shape of parabola bounded by a strate side of length 40 metres. C is the vertx of the parabola and it is equidestance from the two ends A and B of the straight side. A verticle pillar PQ stands at the middle point Q of the straight side. If the angle of elevation of the top of the piller from A and C be respectively (alfa) and (beta) then find the angle of elevation of the piller from the point D on the curved boundary such that angle DQA = 45. Also find the distance of the pillar from the vertex.

Grade:12

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
Dear student

Please ask only one question per post

Regards
Vikas TU
14149 Points
one year ago
Dear student 
Please ask single question in a thread , 
It will be easier for us to ans. 
Good Luck 
Cheers

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