The angle of elevation of the top of a pole from a point A on the ground is 30°. The angle changes to 45° after moving 20 metres towards the base. Then the height of the pole, in metres, is
- A30
- B
- C
- D
The angle of elevation of the top of a pole from a point A on the ground is 30°. The angle changes to 45° after moving 20 metres towards the base. Then the height of the pole, in metres, is