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Two US high school girls rewrite 2,000 years of mathematics with a new Pythagorean proof once thought untouchable

For centuries, the Pythagorean Theorem has occupied a unique position in mathematics: both elementary and profound. Its ...
BBC

How to prove Pythagoras' theorem

STEP 1 - RIGHT TRIANGLE x 4: Take one piece of card and fold it in half, then fold it in half again... Image caption, ... use the ruler and pencil to draw a straight line across the bottom corner of ...