Question 935011

the missing side is hypotenuse {{{c}}} of the right angle triangle; so, use Pythagorean theorem to find it

given legs: {{{a=12}}} and {{{b=9}}}
 
{{{c^2=a^2+b^2}}}

{{{c^2=12^2+9^2}}}

{{{c^2=144+81}}}

{{{c^2=225}}}

{{{c=sqrt(225)}}}

{{{highlight(c=15)}}}

your answer is: {{{15}}}