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′:

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

Related Articles

2 COMMENTS

  1. I know this must be an oversight, but the theory is (axa)+(bxb) = (cxc)
    (can’t squared easily on keyboard)
    so 3×3+4×4=5×5
    not 3+4=5
    so 9+16=25
    3+4=7
    thanks

    • Jonas, 5 is correct. Take the square root of 25 to find the hypotenuse.

      a²+b²=c²
      3²+4²=c²
      9+16=c²
      25=c²
      √25=√c
      5=c

LEAVE A REPLY

Please enter your comment!
Please enter your name here