Surveying - Engineering

Q1:

While measuring the distance between two points along upgrade with the help of a 20 m chain, the forward end of the chain is shifted forward through a distance

A 20 (sin θ - 1)

B 20 (cos θ - 1)

C 20 (sec θ - 1)

D 20 (cosec θ - 1).

ANS:C - 20 (sec θ - 1)

It's called hypotenusal allowance. And option C is correct.