Question 990149
For original square(s=length of side):
{{{Area=s^2}}}
{{{144in^2=s^2}}}
{{{sqrt(144in^2)=sqrt(x^2)}}}
{{{12in=s}}} 
The length of the side is 12 inches.
.
The diagonal of a square (d=diagonal):
{{{d=(s)sqrt(2)}}}
{{{d=(12)sqrt(2)}}}
.
ANSWER: The diagonal is approximately 17 inches.