Length of the string is 122 feet approx.
Height of kite = 100 feet
Angle of elevation = 55°
Length of the string
Sinθ = Perpendicular / Hypotenuse
Sin55 = 100 / Hypotenuse
0.8191 = 100 / Hypotenuse
Hypotenuse = 122 feet (Approx.)
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