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Which of the following methods are employed for setting out a circular curve? A. Weisbach method B. Two theodolite method C. Tacheometric method D. Rankine’s method of tangential angles

Which of the following methods are employed for setting out a circular curve? A. Weisbach method B. Two theodolite method C. Tacheometric method D. Rankine’s method of tangential angles Correct Answer B, C and D only

Locating various points along the length of the curve at equal and convenient distances is known as “setting out a curve”.

Methods employed for setting out a circular curve are:

1. Rankine Method of tangential angles: Rankine method is based on the principle that the deflection angle to any point on a circular curve is measured by one half the angle subtended by the arc from Point of curve to that point.

2. Two theodolite method: This method is used when the ground is unsuitable for chaining and is based on the principle that the angle between the tangent and the chord is equal to the angle which that chord subtends in the opposite segment.

3. Tacheometric method: this method is less accurate than “Rankine Method of tangential angles”.

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