**Contents**show

## How do I make all the lines in AutoCAD the same level?

Use the **FLATTEN command** to change the Z values of all lines, arcs, and polylines to 0. Turn off or freeze any hatch layers with hatch patterns so they are not included in the selection. Type FLATTEN at the command line. Select all objects and press the Enter key.

## Why won’t my lines fillet in AutoCAD?

This happens because **AutoCAD is 3D capable software and cannot connect objects that have no intersection point in 3D space**. To make it work you just have to change all Elevations to 0, or at least have them at equal one.

## Which axis is used to show the depth in AutoCAD?

The axis used to show depth in AutoCAD® is the**W axis**.

## How do you prove two lines are coplanar?

Examine both lines in parametric form. **If their vectors are parallel then they are certainly coplanar**. If their vectors are not parallel, two lines are coplanar if and only iff they intersect; otherwise, they are skew.

## What are lines that are not coplanar?

Two lines that are not coplanar are called **skew lines**.

## What types of lines are coplanar and do not intersect?

Two lines are parallel lines if they are coplanar and do not intersect. Lines that are not coplanar and do not intersect are called **skew lines**. Two planes that do not intersect are called parallel planes.