Verify the Diagonal Measurement (5 Feet)
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What happens here
Now, place the end of your tape measure at the 3-foot mark on one wall line. Extend the tape measure diagonally to the 4-foot mark on the other wall line. If the corner is perfectly square (90 degrees), this diagonal measurement will be exactly 5 feet. If it's not 5 feet, adjust the wall plate slightly until the 5-foot measurement is achieved, indicating a square corner.
Goal: Confirm and achieve a perfectly square corner
Tools and materials
- Tape Measure — Measuring the diagonal to verify squareness
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