To convert angle from radian measure to degree measure, multiply it by 180/π.
So,
a) 5π/4 in degree measure will be:

So, 5π/4 radian is equal to 225°.
b) 9π/5 in degree measure will be:

So, 9π/5 radian is equal to 324°.
c) 2π/3 in degree measure will be:

So, 2π/3 radian is equal to 120°.
d) 4π/9 in degree measure will be:

So, 4π/9 radian is equal to 80°.
e) 5π/6 in degree measure will be:

So, 5π/6 radian is equal to 150°.
f) 7π/4 in degree measure will be:

So, 7π/4 radian is equal to 315°.