Question

# A line that is perpendicular to the plane of the horizon.

- vertical
- horizontal
- diagonal oblique
- oblique diagonal

Hint:

### 1. Plane of the horizon refers to the straight horizontal surface/ line that appears at the end of the visible earth surface and beginning of the sky.

2. A line that intersects any other given line at a 90° angle is said to be perpendicular to the given line.

3. A straight line that is parallel to the Y-axis and that goes from to top to bottom and vice versa is called a vertical line.

4. A straight line that is parallel to the X-axis and that goes from left to right and vice versa (sideways) is called a horizontal line.

## The correct answer is: vertical

### GIVEN-

A line which is perpendicular to the plane of horizon.

TO FIND-

Nature of the perpendicular line.

SOLUTION-

We know that the plane of horizon is a horizontal line and

We are given that a line is perpendicular to the plane of horizon.

Hence, this line intersects the plane of horizon at a 90° angle.

And we know that any line that is at a 90° angle with a horizontal line is a vertical line.

Hence, the given line is a vertical line.

FINAL ANSWER-

Option 'a' i.e. 'vertical' is the correct answer to the given question.

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