Answer: The angle equals  45 ∘  and the supplement is  135 ∘
Explanation:
Since the supplement is three times the angle, we can say   s  =  3 a
Since we know the supplement is Â
180 − a , we can plug that in.
180 - a = 3a
180  = 4 a  (add  a  to both sides)
45  =  a  (divide both sides by  4)
Since we know the angle now, all we have to do is multiply it times  3  to find the supplement.
45  ×  3  =  135