When laying out
structures, the easiest way to get a right angle is to use
triangulation.
 If you have a triangle with sides in a ratio of 3:4:5, the
angle between the 3 and the 4 will always be a right angle.
Use a
tape and any multiples of 3, 4 and 5 to check for square.
Example: 0900 (3 x3
) 1200 (4 x 3) 1500 (5 x
3) |
