Alphabet of Lines

Identify which type of line is #1.

• Dimension Line

• Phantom Line

• Hidden Line

• Extension Line

Identify which type of line is #2.

• Leader Line

• Long Break Line

• Hidden Line

• Center Line

Identify which type of line is #3.

• Section Line

• Long Break Line

• Short Break Line

• Cutting Plane Line

Identify which type of line is #4.

• Section Line

• Hidden Line

• Visible Line

• Cutting Plane Line

Identify which type of line is #5.

• Extension Line

• Hidden Line

• Dimension Line

• Cutting Plane Line

Identify which type of line is #7.

• Extension Line

• Leader Line

• Phantom Line

• Cutting Plane Line

A thick line that represents the visible edges or outline of the object; also known as the object line

• Extension Line

• Hidden Line

• Visible Line

• Phantom Line

Identify which type of line is #6.

• Extension Line

• Leader Line

• Phantom Line

• Cutting Plane Line

A medium thick line composed of short dashes about 2-3 millimeters long with space between dashes about 1-2 millimeters wide; it represents the surface or edges that cannot be seen.

• Extension Line

• Hidden Line

• Visible Line

• Phantom Line

A thin line that extends from the object in order to show dimension limits

• Extension Line

• Hidden Line

• Visible Line

• Phantom Line