This is the basic and conceptual question from trigonometry of height and distance in which we are to find the length of the string if a kite is flying at a height of 75 meters from the ground level, attached to a string inclined at 60o to the horizontal.
Book – RS Aggarwal, Class10, chapter 14, question no 2.
Let AB=75= Height of Pole
and AD be the length of the wire
From △ABD
sin60o=AB/AD
⇒√3/2=75/AD
⇒AD=150/3
⇒150/1.73 (Take3=1.73)
=86.6 m