Question

Find the supplement of 4/3 of right angle

Answer 1

4/3 of right angle = 4/3 * 90 = 120.
Let the supplement of the angle 120 be x
Thus x + 120 = 180
x = 60.
Thus the supplement of the angle 4/3 of the right angle is 60 degrees.

Answer 2

let angle be x
then
x+ 4/3 (90)=180
x+4(30)=180
x=180-120
x=60