Let ABC be a circle, and let a point D be taken outside ABC; let there be drawn through from it straight lines DA, DE, DF, DC, and let DA be through the centre;
Verbi gratia: Quoniam extra circulum AB signabo punctum super quod est G et protraham ab eo lineas ad circulum AB. Sintque linee GD; GE; GZ; GA sitque una earum que transit per centrum GD.
Exempli gratia: Sit circulus AB, sit punctus extra circulum assignatus G. Sint linee ab illo puncto usque ad circulum AB extracte GD et GH et GZ et GA quarum una GD supra centrum transiens omnium longissima.
Title
Book I
