If a straight line be cut at random, the square on the whole is equal to the squares on the segments and twice the rectangle contained by the segments.
SI recta linea secta sit vtcunque: Quadratum, quod a tota describitur, æquale est & illis, quæ a segmentis describuntur, quadratis, & ei, quod bis sub segmentis comprehenditur, rectangulo.