state gov Bihar Police Constable (सिपाही) Mock Test Series 2025 Quantitative Aptitude Trigonometry Heights and Distances
If the angle of elevation of the sun changes from 30° to 45°, the length of the shadow of the pole decrease by 20 meters, then the length (in metres) of the pole is:
1
20(√3 - 1)
2
20(√3 + 1)
3
10(√3 - 1)
4
10(√3 + 1)