From a point 30 m away from the foot of a tower, if the angle of elevation of the top of the tower is 45°, then the height of the tower is ___m.
30
51.96
45
17.32
Question 4 The angle of elevation of the top of a tower from a point on the ground which is 30 m away from the foot of the tower is 30∘. Find the height of the tower.