# Frequent question: How do you draw a line perpendicular to another line in Civil 3D?

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## How do you draw a perpendicular to a line from a given point?

To drop a perpendicular from a point to a line

1. open the compass a distance larger than the perpendicular distance from the point to the line, and scribe an arc intersecting the line at two points.
2. Call the two points B and C. …
3. Call the point where the two arcs meet D. …
4. AD is the line through A perpendicular to BC.
5. Proof.

## How do you draw a line between two lines in Civil 3D?

To Create a Centerline Between Two Lines (AutoCAD Mechanical)

1. Click Home tab Draw panel Centerline drop-down Centerline In-between. Find.
2. Select first contour line (1).
3. Select second contour line (2).
4. Press ENTER.

## Is part of a line with two endpoints?

A line segment is part of a line that has two endpoints and is finite in length. A ray is a line segment that extends indefinitely in one direction.

## Which mode allows users to draw perpendicular lines?

90° straight lines can be drawn by switching the Ortho Mode to ON. or by pressing Function key (F8). Ortho mode is used.

## What is the equation of a line perpendicular to another?

Perpendicular lines have opposite-reciprocal slopes, so the slope of the line we want to find is 1/2. Plugging in the point given into the equation y = 1/2x + b and solving for b, we get b = 6. Thus, the equation of the line is y = ½x + 6. Rearranged, it is –x/2 + y = 6.

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