It can go from 0 to 40°

A Flap is a control surface that is used to kill the lift of a wing to allow the aircraft to descend. I've never heard the term "body Flap" but it must refer to a Flap or a "speed brake" that is located on the fuselage and is used to slow the aircraft. Military aircraft used speed brakes or Dive brakes to slow their speed when diving on a target to drop a bomb. Some aircraft with fuselage speed brakes is the A-1 Skyraider propellor aircraft of Viet Nam and I think the F-86 jet fighter.

The flaps are simply called flaps.

it depends on what type of aircraft your flying, the runway length, and the weather. here are two common aircraft flap settings for standard takeoff use: Boeing 737: set flaps to 5 cessna 172: set flaps to 10 these are two common flap settings for the Boeing 737 and cessna 172. remember, different aircraft have differnet flap settings based on weather and runway length.

All commercial (heavy) aircraft have a range of landing speeds which vary according to landing weight and configuration (flap setting). The normal range for the 747 for various weights and flap settings is around 130 to 160 kts.