Answer:
The length of the slide he needs to make = AC = L = 14.3 ft
Explanation:
From the Δ ABC
AC = Length of the slide = L
AB = 9 ft
°
From Δ ABC

Put all the value in the above formula


L = AC = 14.3 ft
Therefore the length of the slide he needs to make = AC = L = 14.3 ft