Question

Teorema de pitagoras......

Answer 1

$(5)^2=x^2+x^2\\\\2x^2=25\\\\x^2=\frac{25}{2}\\\\x=\frac{5}{\sqrt{2}}\\\\x=\frac{5}{\sqrt{2}}\times\frac{\sqrt{2}}{\sqrt{2}}\\\\\boxed{x=\frac{5\sqrt{2}}{2}}$