# The Line Normal to the Plumb Line is Known as

By Aina Parasher|Updated : July 12th, 2022

The line normal to the plumb line is known as-

1. Horizontal line
2. Level line
3. Datum line
4. Vertical line

## The line normal to the plumb line is known as level line.

Solution

Horizontal line: Horizontal line is the line that is tangential to the level surface at any point. The horizontal line is also normal to the plumb line in case of plain surveying.

Level line: Level line is the line that is always normal to the plumb line of the earth's surface. In the case of plane surveying, the level line and horizontal line are the same. But in the case of geodadic surveying, these lines are different. Hence, the line normal to the plumb line is known as level line.

Datum line: It is the reference line from which measurements are taken.

Vertical line: It is the line that is perpendicular to the horizontal line. In the case of plane surveying, vertical line and plumb line are the same.

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