Which of the following statements about dimensions on a blueprint is true?

• A. Chords
• B. Dimensions
• C. Annotations
• D. Notes

Answer: (B)

Dimensions are the measurements that define the size and position of features on a blueprint. They are the numeric values with units that indicate lengths, diameters, radii, hole spacings, and overall extents, tied to the features by dimension lines, extension lines, and arrowheads. These values tell you exactly what to cut or drill and where to place everything, including tolerances to control variation.

Chords refer to a straight line connecting two points on a circle and aren’t used to describe blueprint measurements. Annotations are notes that explain features or methods but aren’t the actual size values. Notes provide additional information or instructions but do not represent the dimensional specifications.