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In this lesson, we will learn what the pythagorean theorem is and how to calculate the sides of a right triangle using Pythagoras Theorem. The Pythagorean theorem formula is used to find any side of a right triangle given the lengths of the other two sides. The pythagorean theorem is used in many subjects and forms the basis for trigonometry, as the sine and cosine functions are projections on the unit circle and can be found by calculating using the Pythagorean theorem.