Triangle Hypotenuse if the 2 triangles ABC and BCD in the image i provided shared the same Hypotenuse which is BC and it's length is 5, and the Hypotenuse opposite angle is 90, are the two triangles always share the same properties ? !Image1

Not necessarily. In your image, $ABC$ is a 3-4-5 triangle, and $BCD$ _looks_ like one too, but all we really know about $BCD$ is that its hypotenuse is 5 and it has a right-angle. It could be another 3-4-5 triangle, or it could be an isosceles right-triangle with catheti of length $5/\sqrt{2}$, or countless others. You'd need to know one of the other sides or angles of $BCD$ to be able to fully describe it.