Question

For $y-axis$ and every line parallel to $y-axis$, the inclination is

• A. zero
• B. ${90}^0$
• C. ${180}^0$

Answer 1

The correct option is B ${90}^0$

The angle which a straight line makes with the positive direction of $x-axis$ measured in the anti-clockwise direction is known as inclination of the line.
The $y-axis$ and any line line which is parallel to $y-axis$ is perpendicular to the $x-axis$ as shown below.

So, for $y-axis$ and every line parallel to $y-axis$, the inclination is ${90}^0$