hat
Pou ang egzak la an 90 degre se yon welcome. Yon triyang ki gen kote 3:4:5 mèt (ou ak multiples de sa anpil) gen yon ang 90 degre. Fixer sou yon bò nan kwen 3 mèt, sou lòt-4 ak distans ant pwen yo dwe exactement 5 mèt.
eng
For the exact angle of 90 degrees is one step. Triangle with sides 3:4:5 m (or with sides that are multiples of these figures) has an angle of 90 degrees. Lay on one side of the angle of 3 meters, on the other - 4 and the distance between the points must be exactly 5 feet.