supposeSuppose we have an isosceles trapezoid whose length of the associated square is 20$20$ and the length of the hypotenuse of the triangles is 30$30$. I want to determine if it is possible to find the height of the triangles, I think no.
http://mathworld.wolfram.com/IsoscelesTrapezoid.html
(Taken from http://mathworld.wolfram.com/IsoscelesTrapezoid.html.)
So in our case a=20$a = 20$ and c=30$c = 30$, we want to find h$h$.
Suppose x$x$ is the base of one of the triangles, note that x$x$ can be free. Then x^2+h^2=30^2$x^2 + h^2 = 30^2$ so simply pick two distinct such x$x$ and then h$h$ will not be unique.
Is this correct?