Question

18. One angle is equal to three times its supplement. The measure of the angle is
(a) 120°
(b) 180°
(c) 135°
(d) 140°​

Answer 1

Answer:

135°

Step-by-step explanation:

as we know that supplementary angles sum always will be = 180°

Also => x+3x = 180

=> 4x = 180

=> x = 45

then c is the right answer

Answer 2

Step-by-step explanation:

let, the angle be x.

then ,it's supplimentry angle is (180-x).

Now,

=>x=3(180-x)

=>x=540-3x

=>4x=540

=>x=135degree.