No-one really thinks that much in terms of "pitch angle" (unless you have unreliable airspeed indications). Having said that, a normal pitch angle on final approach for a big jet is about 2-2 1/2 degrees nose up.
20NM at an altitude of 3,000ft at about 175KIAS
is a bit low bro. A normal speed/altitude at 20NM from touchdown is 250KIAS/5,000ft