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He uses figures to know the center of gravity. For example, he used triangle centers to prove the center of gravity. Every triangle has four special centers. These centers are circumcenter, barycenter, triangle centroid, orthocenter and incenter. This can be found in any of the three kinds of triangles: equilateral, isosceles and scalene. Archimedes used this as a basis to find the center of gravity. The definition of gravity is “the tendency of bodies to be attracted toward the center of the