SnipperCR:

...Angle of Attack is the angle between the relative wind and the chord line of a wing... Chord line is defined as leading edge to trailing edge. When we lower flaps, we have changed our trailing edge position and increase the angle of attack. Therefore we are generating more lift due to a higher angle of attack...

This statement is ok as far as it goes, but it would have you thinking a wing keeps the same or even higher AoA after the flaps go out which is not the case. The airplane immediately noses over in an attempt to maintain equilibrium between weight and lift. Also it is not the higher AoA that creates the extra lift, it is the greater camber of the flapped wing that creates the extra lift. AoA actually goes down after a fresh equilibrium is established.