Chamfers are normally formed at 45 degrees.

• A. 30
• B. 45
• C. 60
• D. 90

Answer: (B)

Chamfers create a beveled edge that smooths the transition between two perpendicular surfaces, removing a sharp corner. The standard practice is to form this bevel at 45 degrees because it gives a balanced relief on both faces, making the edge easy to fabricate with common formwork or machining and easier to finish. A 45-degree bevel also helps prevent chipping or snagging during handling and assembly, and it provides a predictable, uniform edge that mates well with other surfaces in tilt-up construction. If the bevel is too shallow, the edge remains sharp and vulnerable; if it’s too steep, you remove too much material and can complicate fit or reduce edge strength. A right-angle cut would not be a bevel at all, leaving a square edge.