Question 192726
The  angle  of  elevation  is  the  angle  between  horizontal  ground  and  the  string

a  right triangle  is  formed, the  distance  along  ground  is  one  leg,  the  other  leg  is  the  height  of  the  kite,  and  the  hypotenuse  is  the  string  length.  The  angle  of  elevation  is  opposite  the  height.

the  trig  function  is  opposite / hypotenuse  or  sin.

sin35 = 100 /  hyp

hyp = 100/sin35 =174.3446=174  ft