# Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 1 (Q.No. 35)

35.

If θ is the slope of the ground and

*l*is the measured distance, the correction isDiscussion:

7 comments Page 1 of 1.
Kuldeep kumar said:
3 years ago

Right answer is A.

(1)

Ameiry Hassan said:
5 years ago

Slope correction = l-D, where l is sloping distance and D horizontal distance, construct a right-angled triangle ABC whose hypotenuse is l, adjacent D and the angle subtended between l and D be theta (θ) solve for D using trigonometric ratio u will get D= lcosθ then recall,

Correction = l-D

=l-lcosθ

= l(1-cos θ)

Using the concept of half angle formula 1-cosθ= 2sin^2θ/2 and therefore correction= 2lsin^2(θ/2).

Correction = l-D

=l-lcosθ

= l(1-cos θ)

Using the concept of half angle formula 1-cosθ= 2sin^2θ/2 and therefore correction= 2lsin^2(θ/2).

(1)

Priyanka Shah said:
5 years ago

@All.

how comes D=I cosθ. Please explain it.

how comes D=I cosθ. Please explain it.

Akki said:
5 years ago

D means? Give expansion for the formula.

SARAVANARAJA said:
6 years ago

How D=lcosθ?

(1)

Vamsi suppu said:
9 years ago

Slope correction = L-D.

L=l.

cos@=l/D.

D=ICOS@.

Correction = L-D.

= l-lcos@.

= l(1-cos@).

= l(2sin@/2).

L=l.

cos@=l/D.

D=ICOS@.

Correction = L-D.

= l-lcos@.

= l(1-cos@).

= l(2sin@/2).

Danesh said:
9 years ago

Slope correction= L-D.

Here L=l.

D=lcos@.

So Correction = l-lcos@.

= l(1-cos@).

= 2lsin^@/2.

Here L=l.

D=lcos@.

So Correction = l-lcos@.

= l(1-cos@).

= 2lsin^@/2.

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