Explanation:
To solve this you would use trigonometry. You would draw a triangle and mark the lower angle between the diagonal and horizontal line as 60. Then you would label the adjacent side as 50ft.
This means you are looking for the opposite and have the adjacent
To find the height you would do:
tan60 = Height÷50
Height = 50 tan60 = 86.6 feet (to 3 sf)