Use the Cosine Rule to find one angle:
72=42+52-2(4)(5)cos(x),
49=16+25-40cos(x),
8=-40cos(x), cos(x)=-⅕=-0.2, x=101.537° approx or 101° 32.2'.
To get the minutes multiply the fraction 0.537 by 60.
sin(x)=0.9798 approx.
We can use the Sine Rule to find another angle. x is the angle opposite the 7m side.
sin(x)/7=sin(y)/4, so sin(y)=4sin(x)/7=0.5599 approx, y=34.048°=34° 2.9'.
The third angle is 180-(34.048+101.537)=44.415°=44° 24.9' approx.