Old framer trick to square two perpendicular lines.

[Falcon67]

Assuming that the building is actually a parallelogram. That's a big assumption the way some contractors operate.

LOL, used both the pythag and the diagonal to confirm my slab was 6" out of square. Shoulda done double check on the contractor that before the pour...

 

[Sawdustmaker]

Some old hippie caught another hippie trippin' on acid.

Some Old Hens Cackle All Hours Till Old Age

 

[LXCam]

Is that a cookie recipe?

Ya, my SIL recipe. After a year of marriage we changed my BIL name to chip.

 

[racer-john]

LX Cam translated:
I got on a rope with a knot tied in it right here

 

[Sawdustmaker]

Use of the geometry theorem:

If the diagonals of a parallelogram are equal, then the parallelogram is a rectangle (4 right angles).

Another theorem for your enjoyment

If the diagonals of a quadrilateral are equal and bisect each other, then the quadrilateral is a rectangle. (4 right angles).

 

[Sawdustmaker]

LOL, used both the pythag and the diagonal to confirm my slab was 6" out of square. Shoulda done double check on the contractor that before the pour...

Another theorem for your enjoyment

If the diagonals of a quadrilateral are equal and bisect each other, then the quadrilateral is a rectangle. (4 right angles).

 

[Falcon67]

I got a cramp in my quads last night, I went vertical in a hurry.