Which tool is typically used to verify squareness in cabinet corners during assembly?

• A. Tape measure
• B. Carpenter's square
• C. Pliers
• D. Level

Answer: (B)

Verifying squareness means making sure two sides meet at a true 90-degree angle in the corner. A carpenter's square is built for that exact purpose—the fixed right angle lets you press it into the corner and confirm that both adjacent faces lie flush against its sides. When the corner is square, the square sits neatly against both surfaces; if not, you’ll see a gap or misalignment that tells you to adjust the parts until the edge sits squarely.

Tape measures measure length, not angle. A level checks horizontal or vertical planes, not the internal angle between two edges. Pliers are for gripping and bending, not checking corner angles. So the carpenter's square is the tool you use to verify squareness in cabinet corners during assembly.