Question

an angle is 20 degree less than thrice its supplement find the measure of the angle​

Answer 1

Answer:

Step-by-step explanation:

In the pic.....

angle = 130

Answer 2

Let the measure of required angle be= X°

Then measure of its supplement = (180-X°)

=> X=3(180-x)–20 => X= 180x3 – 3X–20

=> 4X= 540–20 => X= 520÷ 4

:. X = 130°