PLTW DM 1.2 Sketching

A line type that is used to indicate the axis of symmetry for a part or feature.

• Centerline
• Construction Line
• Dimension
• Extension Line

Thin lines that serve as guides while sketching or drawing.

• Construction Line
• Diameter
• Extension Line
• Hidden Line

A straight line passing from side to side through the center of a circle or sphere.

• Hidden Line
• Dimension
• Diameter
• Isometric

A measurable extent, such as the three principal dimensions of an object of width, height, and depth.

• Isometric
• Extension Line
• Dimension
• Leader Line

A thin solid line perpendicular to a dimension line, indicating which feature is associated with the dimension.

• Hidden Line
• Extension Line
• Leader Line
• Object Line

A line type that represents an edge that is not directly visible because it is behind or beneath another surface.

• Orthographic Projection (multiview)
• Isometric
• Object Line
• Hidden Line

A form of pictorial drawing in which all three drawing axes form equal angles of 120 degrees with the plane of projection.

• Perspective Drawing
• Leader Line
• Orthographic Projection (multiview)
• Isometric

Lines that are thin and used to connect a specific note to a feature.

• Leader Line
• Object Line
• Perspective Drawing
• Plane

A heavy solid line used on a drawing to represent the outline of an object.

• Object Line
• Orthographic Projection (multiview)
• Plane
• Radius

A method of representing three-dimensional objects on a plane having only length and width.

• Perspective Drawing
• Orthographic Projection (multiview)
• Radius
• Scale