sharing some figures from the Mx manual, even if they are not describing what happens at every setting change...
H. The angle of flap extension is measured relative to the wing chord plane.
When the flaps are fully retracted, the trailing edge of the aftflap is
aligned with the wing chord plane. When the flaps are extended to 40
units, the angle between the wing chord plane and the midflap is
approximately 43 degrees. Since the aftflap moves relative to the
midflap, the aftflap rotates to an angle of approximately 69 degrees from
the wing chord plane.
when the trailing edge flaps extend to the
0- to 1-unit position, pressurized fluid is ported through one of the
cylinder ports to fully extend the leading edge flaps and slats 2, 3, 4,
and 5. Slats 1 and 6 extend to the intermediate position. Moving the
trailing edge flaps to the 30-unit position ports pressurized fluid
through both cylinder ports. With the control valve in this position,
leading edge slats 1 and 6 fully extend.