## Simple Solutions

### How to Find Square Layout Lines

##### By: Joe Truini

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.

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#### 2 Comments on “How to Find Square Layout Lines”

• Lindsay Hughes Says:
June 15th, 2016 at 10:39 am

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

• jonas Says:
June 14th, 2016 at 9:26 am

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

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