If laying out square lines is part of your next home improvement project, here’s a great way to do it using the Pythagorean theorem (A² + B² = C²) to form a right angle triangle with 3′ and 4′ sides and a diagonal of 5′:

• Establish a 4′ line parallel to a wall.
• Measure out 3′ from one end of the 4′ line roughly perpendicular to it.
• Hold a tape measure on the other end of the 4′ line.
• Measure 5′ on the tape measure so it forms a triangle with the end of the 3′ line.
• Adjust the angle of the 3′ line until the tape measure aligns with it.

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