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How do we calculate the area of a trapezoid? We will derive the formula, but we will see that we can remember it in different forms. More videos and interactive exercises can be found at https://cs.khanacademy.org The Khan Academy is responsible for Czech translations. Want to help us? Sign up here: https://cs.khanacademy.org/contribute Follow us on social networks! Facebook: / khanovaskola Twitter: / khanovaskola Original: • Area of a trapezoid Perimeter, area...