We have been asked to find the height of a tower if the tower stands vertically one the ground. From a point on the ground, 20 m away from the foot of the tower, the angle of elevation of the top of the tower is 60•.
Book RS Aggarwal, Class 10, chapter 14, question no 1
Trigonometry
Height and distance.
Here, AB is the height of a tower.
⇒ CB=20m
⇒ Now, tan60o=AB/CB
⇒ √3=AB/20
∴ AB=20√3m
∴ Height of a tower is 20√3m.