A simple DIY tip to determine a 90 degree angle when setting out your building site is the 3,4,5 method. Basically if you mark out a triangle that has sides measuring 3 feet, 4 feet and 5 feet (or metres) you will end up with a right angle triangle. This is a very simple solution that can be handled by just one handyman, a tape measure and some pegs.
NOTE: Keep in mind that the measurements can be multiples of 3,4,5. You can use 6,8 and 10 or 9, 12 and 15 etc.
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