Question

Solve for X. I don't know how

Answer 1

9 is the hypotenuse of an isosceles triangle. In basic 45 45 90 triangles, the hypotenuse is square root of two times the short sides. Therefore divide 9 by square root two, and the times by two because it is half of the side. You will therefore get 9 times Square root 2. The answer will therefor be 12.73

Answer 2

$x=2m\\\\m^2+m^2=9^2\\2m^2=81\\m^2=40.5\\m=\sqrt{40.5}\\\\x=2\sqrt{40.5}\approx12.7$