Consider the following figure, which is an extract from a contour map (scale = 1 : 20,000) of an area. An alignment of a road at a ruling gradient of 4% is to be fixed from the point O and beyond. What should be the radius of the arc with O as the center to get the point of alignment of the next contour on the map?
0.025 cm
0.25 cm
2.5 cm
5.0 cm
2.5 cm
The contour interval = 20m
For 4% gradient, the length needed from one contour to another
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