Question 224848
Use:
{{{a^2+b^2=c^2}}}
The {{{a}}} and {{{b}}} are our sides, or the given base and height in this case. The {{{c}}} is our missing side's distance.
Plugging in our values:
{{{15^2+13^2=c^2}}}
Simplifying:
{{{225+169=c^2}}}
{{{394=c^2}}}
Take the sqaure root of 394 to give us:
{{{c=19.85 ft}}}