The Pythagorean theorem states:

In a right triangle, the sum of the squares of the legs equals the square of the hypotenuse.

The formula for it is: a² + b² = c²

Simple calculation of a right angle using a folding rule or a tape measure in open terrain is possible:

Two sides measuring 3 and 4m in length are marked. Test: the diagonal must be 5m long.
It works the same way with 6, 8 and 10 metres.

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