With the informations given by the question, we have the following diagram:
To calculate the height, we have the following trigonometric relation(since it is a right triangle):
[tex]h=420\cos (60^{\circ})[/tex]
Just solving for 'h':
[tex]h=420\cos (60^{\circ})=420\times\frac{\sqrt[]{3}}{2}=210\sqrt[]{3}\approx363.7[/tex]
With this, we have our height. The height of the kite is 363.7 ft
