Question 437230
sin {{{theta}}} = vertical/hypotenuse
Sine{{{theta}}} = 20/80 
Sine{{{theta}}}= 1/4
{{{Theta}}}=15 deg
..
Cos {{{theta}}} = base/hyptenuse
Cos 15* 80 = base
0.9659*80= 77 feet ground distance (approx)