Which joint is a 45-degree joint often used in picture frames?

Which joint is a 45-degree joint often used in picture frames?

• A. Dovetail Joint
• B. Mitre Joint
• C. Tongue and Groove
• D. Screw Joint

Answer: (B)

The main idea here is how joints create clean, angled corners for picture frames. A mitre joint is formed by cutting the ends of the two frame pieces at 45-degree angles so they meet to form a neat 90-degree corner. This specific 45-degree cut is why it’s the go-to choice for frames—it hides end grain and gives a tidy, decorative edge. Dovetail joints are interlocking and very strong, usually used in drawers and boxes, not for frame corners. Tongue and groove is about fitting a projection (tongue) into a groove along the length, common in panels or flooring, not for making a corner. A screw joint is just fastening pieces together with screws and doesn’t produce the characteristic mitered corner required for picture frames.

The main idea here is how joints create clean, angled corners for picture frames. A mitre joint is formed by cutting the ends of the two frame pieces at 45-degree angles so they meet to form a neat 90-degree corner. This specific 45-degree cut is why it’s the go-to choice for frames—it hides end grain and gives a tidy, decorative edge.

Dovetail joints are interlocking and very strong, usually used in drawers and boxes, not for frame corners. Tongue and groove is about fitting a projection (tongue) into a groove along the length, common in panels or flooring, not for making a corner. A screw joint is just fastening pieces together with screws and doesn’t produce the characteristic mitered corner required for picture frames.