Chithu purchased a rectangular plot measuring 49 m × 46 m to construct a house. As a first step, he dug a well of 7 m radius and 40 m depth. During this action, the earthen soil was spread evenly in the field. Find the increase in the height of the field.
1
2.933 meters
2
3.142 meters
3
4.536 meters
4
3.456 meters