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This is called...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eThousands of years ago it was discovered that the two smaller squares on the side of a right angle triangle added up to the exact same size as the larger square on the triangle - the square formed on the diagonal side. This is called Pythagoras Theorem. When we know the length of two sides of a right angle triangle, we can use Pythagoras to find the length of the final side. This only applies for right-angle triangles. But it does not matter which combination of two sides we have, we just rearrange Pythagoras depending upon which sides we have (shorter or the long). SUBSCRIBE to the FuseSchool YouTube channel for many more educational videos. Our teachers and animators come together to make fun \u0026 easy-to-understand videos in Chemistry, Biology, Physics, Maths \u0026 ICT. 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