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Let's introduce the famous and very important Pythagorean theorem! Practice here: https://cs.khanacademy.org/math/basic... More videos and interactive exercises can be found at https://cs.khanacademy.org The Khan School association takes care of Czech translations. Want to help us? Sign up here: https://cs.khanacademy.org/contribute Follow us on social media! Facebook: / khanovaskola Twitter: / khanovaskola Original: AA6RfgP-AHU