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Available as an eBooklet/PDF

Pythagoras’ famous 3 4 5 sided triangle is usually drawn using set square and ruler but this method is slow and inaccurate. The instructions show how to draw the construction using compass geometry which is faster, more accurate and, apart from an initial radius, needs neither dimensions nor calculations.

Two visual proofs of the 3 4 5 triangle are also shown.

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Laurie Smith's website