Question 318888
If {{{a}}} is one of the legs, then
{{{a^2+12^2=13^2}}}
{{{a^2=169-144}}}
{{{a^2=25}}}
{{{highlight( a=5)}}}
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.
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If {{{a}}} is the hypotenuse,
{{{a^2=b^2+c^2}}}
{{{a^2=144+169}}}
{{{a^2=313}}}
{{{highlight( a=sqrt(313))}}}