A new study claims that the druids who built Stonehenge knew Pythagoras’ Theorem, 2000 years before the Greek philosopher was born. Pythagoras is widely acknowledged as the man who formally stated that, in a right-angled triangle, the square on the hypotenuse (the longest side, opposite the right-angle) would have the same area as the sum of the squares of the other two sides. For example, in a right-angled triangle with side lengths of 3, 4 and 5 metres, the area of hypotenuse-square (25 square metres) would equal the area of the other two squares combined (9 sq m plus 16
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