circuli te intus contingant , & ex puncto contactus a ducatur tangens, & . “ . . perpendicularis ac b . qua ’ per centra duorum circulorum ransibtt , fe . f . ) & pneterea I juavis alia linea secans du os circulos in e & i , Dico semper a e . a d a c ab - , eam ductis line s e c & db > trian gula… … c 3 Liber
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