For the exact angle of 90 degrees is one step. Triangle with sides 3:4:5 meters (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.
Täpse 90 kraadise on üks samm. Kolmnurk, mille külgede 3:4:5 meetrit (või küljel, mis on kordne need arvud) on nurk 90 kraadi. Lay ühel pool nurga 3 meetrit, teisel - 4 ja kaugus kahe punkti vahel peab olema täpselt 5 meetrit.