The Content Of The Article:

The geometry applied to the DIY is sometimes problematic: here is a simple explanation to draw a right angle to the wall and finally use the theorem of Pythagoras in real life. Convenient!

how to draw a right angle in the middle of a wall

  • Mark a point P on the wall and draw a segment multiplied by three to get a point A to post on the wall.

successfully drawing a right angle on a wall

  • From P, draw an arc with the same segment multiplied by four (to apply the Pythagorean theorem to the right triangle).

the math applied to DIY

  • Since A, draw another circle in five segments.
  • The two arcs intersect in B.
  • The line PB is perpendicular to the wall.

Video Instruction: How to Draw a Perfect Circle Freehand - 3 hacks and techniques