A French curve is used to draw perfect circles.

Dividers are primarily used to transfer distances.

In third-angle projection, the right-side view is placed to the left of the front view.

An oblique surface appears foreshortened in all three principal views.

Visible (object) lines take precedence over hidden and centerlines.

Hidden lines are drawn thick with long dashes.

Section lines are used to indicate the material cut by a section plane.

Phantom lines are used to show alternate positions or repeated details.

Centerlines indicate axes of symmetry and hole centers.

Mechanical/engineering scales are best for site plans in feet.

Architect’s scale 1/2"=1' equals 1:24.

Cutting-plane lines are typically thin and continuous.

Tangent edges are always shown to emphasize curved transitions.

Isometric axes are typically at about 30° from the horizontal.

In good drafting, construction lines are heavy and dark.

Extension lines should touch the object line at their origin.

A principal plane appears true size in one of the principal views.

An inclined plane appears as an edge view in one principal view.

A protractor is used to transfer distances.

A compass is preferred over dividers to step off equal spacings on a line.

Lettering in drafting is typically uppercase, sans-serif, and unidirectional.

The top view in third-angle projection is placed below the front view.

Polyester film (Mylar) is more durable than tracing paper.

Phantom line pattern is long dash – short – short.

Hidden line pattern is short dashes evenly spaced.

Dimension text should be placed on top of object lines.

Adjacent parts in a section view should use the same hatch angle.

Isometric dimensions should be aligned with the isometric axes.

A 30-60 triangle can directly draw 30°, 60°, and 90° angles.