Question

A kite is flying at a height of 30 m from the ground. The length of string from the kite to the ground is 60 m. Assuming that there is no slack in the string, the angle of elevation of the kite at the ground is :

(A) 45°

(B) 30°

(C) 60°

(D) 90°

Answer 1

Answer is (B) 30°

Let A is a kite which is 30 meter high from the ground which is flying with string of 60 m long.

Let ∠ACB = θ

From right angled

sin θ = AB/AC

⇒ sin θ = 30°/60°

⇒ sin θ = 1/2

⇒ sin θ = sin 30°

⇒ θ = 30°