To solve this question we will use the following diagram as reference:
To answer the question we have to find the missing side of the right triangle, using the Pythagorean theorem we get:
[tex]b=\sqrt[]{c^2-a^2}.[/tex]Where a, and b are the legs of the triangle, and c the hypothenuse.
Substituting a=84, and c=91 we get:
[tex]b=\sqrt[]{91^2-84^2}=35.[/tex]Answer: 35 ft.
