Answer:
The angles are 36° , 144°.
Explanation:
If sum of two angles add up to 180°, then they are called supplementary angles.
Let one angle be 'x' and its supplementary angle be y.
y = 4 times its supplementary
y = 4*x
y = 4x
x + y = 180 {supplementary angles}
- Substitute y = 4x in the above equation,
x + 4x = 180
5x = 180
x = 180 ÷ 5

y = 4x
= 4*36

Answer: The angles are 36° , 144°