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Accurate curved features are essential in a scale drawing, and the way to achieve this is by inserting curves and radii. When a drawing includes rounded elements—arcs, curved walls, door radii, or decorative profiles—defining the exact arc with its radius and center ensures those features scale correctly and can be reproduced or built to fit. Without specifying curves and radii, those parts would have to be approximated with straight segments, introducing errors in measurements and overall geometry.

Photos can provide context, but they’re not required for the drawing itself. Estimating distances by eye undermines the precision a scale drawing aims to deliver. Orientation, like knowing which direction is north, helps with context and layout but isn’t what makes the drawing accurate; the crucial factor for fidelity is correctly representing curved segments through curves and radii.