As speed reduces, angle of attack has to increase to keep lift constant until the critical angle is reached. The airspeed at which this angle is reached is the (1g, unaccelerated) stalling speed of the aircraft in that particular configuration. Deploying flaps/slats decreases the stall speed to allow the aircraft to take off and land at a lower speed.
As speed reduces angle of attack has to increase to keep lift constant until the critical angle is reached The airspeed at which this angle is reached is the (1g unaccelerated) stalling speed of the aircraft in that particular configuration Deploying flaps/slats decreases the stall speed to allow the aircraft to take off and land at a lower speed