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Pythagoras' Theorem Pythagoras Theory is a relatively simple theory used continuously in Standard Grade Mathematics and beyond. It is also used in Physics. It is used not only to simply solve the missing side of a right-angled triangle but also more extensively to solve Reasoning and Application problems and also can be used to solve many higher mathematics problems in trigonometry and in many topics throughout the mathematics syllabus. It is so basic that I'm sure anyone who studied it at school will remember it long after other theorems have been forgotten. Early evidence of the theory can be traced back as far as 2000 BC with the ancient Egyptians. Pythagoras had travelled to Egypt and this may have influenced some of his beliefs. There is some evidence that they used a 3-4-5 triangle to form a perfect right angle. However very little information pre-dates the Greeks so this remains a mystery...

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