Answer:
Option A
Explanation:
Given :-
- A line is given which has three angles a , b and 90° .
We need to find the relationship between a and b. Also we know that the measure of angle of straight line is 180 ° .
According to Question :-
a + b + 90° = 180°
a + b = 180° - 90°
a + b = 90°
Hence the angles a and b are complementary.