Question 837224
For a right triangle {{{a^2 + b^2 = c^2}}}
For our problem, c = 18 and a and b are the same length
so we have {{{a^2+a^2=c^2}}} or
{{{a^2+a^2=(18)^2}}}
{{{2a^2=324}}}
divide each side by 2
{{{a^2=162}}}
take square root of each side
{{{a = sqrt(162)}}} which is approximately 12.2728