Archimedes made important contributions to geometry through his method of discovery and treatise "The Method". His approach involved balancing cross-sections of figures against known figures using laws of leverage. He would present his method of discovery before giving a rigorous proof. "The Method" contained Archimedes' processes for discovering many results on areas and volumes mechanically. Some of his key propositions included finding the volume of a cylinder inscribed in a parallelepiped and showing that a parabolic segment is 4/3 the size of an inscribed triangle.