Question 1016552
Have you this situation?
x, the side length for the small window.
x+5, the side length of the big window.


Your equation for the start, {{{highlight_green(x^2+(x+5)^2=1025)}}}


{{{x^2+x^2+10x+25=1025}}}
{{{2x^2+10x+25-1025=0}}}
{{{2x^2+10x-1000=0}}}
{{{x^2+5x-500=0}}}
{{{highlight_green((x-20)(x+25)=0)}}} which should make you feel very happy.