: "Object lines" show main outlines, while "hidden lines" show non-visible edges.
: "Rise and run" determines the slope; a 6/12 pitch means the roof rises 6 inches for every 12 inches of horizontal run. Mathematical Foundations : CARPENTRY AND LANDSCAPING TEST
: Standard on-center (OC) spacing for floor joists and studs is usually 16 inches. : "Object lines" show main outlines, while "hidden
: Measuring diagonals both ways is more accurate for large rectangular objects than the 6-8-10 method. Blueprints & Drafting : : "Object lines" show main outlines