Answer:
The angle measures 45° and its supplement is 135°.
Step-by-step explanation:
We have two supplementary angles: Angle A and angle B
Let angle A be x° and;
Angle B be 3x°
We know that supplementary angles add up to 180°
So x° + 3x° = 180°
4x° = 180°
x° = 45° and 3x° = 135°
So angle A measures 45° and its supplement, angle B, is 135°
