Explicación paso a paso:
Recordemos que 1π rad = 180°
a)
1π rad --------------->180°
X <-------------------132°
X = π rad × 132°/180°
X = 11/15 πrad
b)
72° 59'48"
59/60 = 0.983
48/3600 = 0.0133
72 + 0.983 + 0.013 = 72.996°
c)
1
1π rad -------------->180°
9π rad -------------->X
X = 1620°
