Hi there,
The number you enter to rotate a component along the X, Y or Z axis is actually the amount of radians you are rotating that element by!
When you are choosing an axis to rotate your component around, the X axis is straight across, the Y axis is straight up and down, and the Z axis can be imagined as going from the front of your phone to the back of your phone.
The following is a screenshot of three Buttons which have been rotated by 3.14 radians (180 degrees) around the X, Y and Z axis.