Math

$sin(x)=\frac{opposite }{hypotenuse }<=> sin(65)= \frac{15 ft}{d} <=> d= \frac{15}{0,906}$

d~16,556 ft

Hope this helps!

Sin of right triangle = opposite / hypotenuse

  You need to find the hypotenuse of this triangle

sin 65 = 15/hyp

re-arrange

hyp = 15 /sin 65   =  ~16.6 ft