Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 4 (Q.No. 41)
41.
α, β are the horizontal angles measured at the ends of a base line AB to a hill top whose angle of elevation from station A is θ°. The height of the hill top above the trunnion axis of the theodolite station, is
Discussion:
5 comments Page 1 of 1.
Gajendra Raj Joshi said:
2 years ago
The correct option should be A if the horizontal angle at A and B are respectively α and β.
Pkota said:
4 years ago
Didn't understand. Please explain in detail.
Saif said:
5 years ago
The angle α should be extended at station A and β at station B. So, option A turns is right.
(1)
Saif said:
5 years ago
@Kcube.
You are right, Thanks.
You are right, Thanks.
Kcube said:
6 years ago
The correct answer should be Option A.
AC/Sinβ=BC/sinα=AB/sin[180-(α+β)]--------------properties of triangle.
AC=AB Sinβ / sin[180-(α+β)].
the vertical angle at A to the top of Hill is given as θ.
therefore---------H(height of hill) = AC tanθ
or H = AB sinβ tanθ/sin[180-(α+β)]
AC/Sinβ=BC/sinα=AB/sin[180-(α+β)]--------------properties of triangle.
AC=AB Sinβ / sin[180-(α+β)].
the vertical angle at A to the top of Hill is given as θ.
therefore---------H(height of hill) = AC tanθ
or H = AB sinβ tanθ/sin[180-(α+β)]
(2)
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