Calculate the vertical distance between X and Y. When a tacheometer is set up at X and the readings on the staff at Y are 1.77 m, 2.12 m, 2.34 m and the inclination of line of sight is + 1° 9ꞌ. Take k = 100, c = 0.3?
1
1.15 m
2
2.51 m
3
2.15 m
4
1.51 m