Question

11. Solution:
Let (x - 20°) and xº be the first and second angle respectively
We know that sum of supplementary angle is equal to 180°.
.. (x - 20°) + x = 180°
2x – 20° = 180°​

Answer 1

Step-by-step explanation:

(x-20°) + x = 180°

2x - 20° = 180°

2x = 180° - 20° = 160°

x = 160°/2 = 80°

Therefore, first angle = (x-20°) = 80° - 20° = 60°

and second angle = 80°