Question 1187805
The shape is half a square; isosceles triangle, two angles of 45 degrees each.


{{{x^2+x^2=5^2}}}

{{{2x^2=5^2}}}

{{{x^2=5^2/2}}}

{{{x=5/sqrt(2)}}}---------------and if you want, you can rationalize the denominator.



{{{(5/sqrt(2))(sqrt(2)/sqrt(2))}}}--------simplify this.