A kite is flying at a height of 145 m. The thread attached to it is assumed to be stretched straight and makes an angle of 60° with the level ground. The length of the string is?
Answer & explanation
Correct answer: option 4
AC = length of string
θ = angle of elevation
AB is the height of kite above ground
sin 60° = \(\sqrt {3}\) : 2
(AB) (BC)
↓ ↓
145 \(\frac{145}{\sqrt {3}}\) × 2 = \(\frac{ 290 }{\sqrt {3}}\)