Abstract
Sit circulo .a.b.g.d. inscriptum quadrilaterum .a.b.g.d. cuius diametri .a.g. et .b.d. Dico quod sit ex .b.d. in .a.g. esse equale duobus que fiunt ex .a.d. in .b.g. et ex .a.b. in .d.g. rectangulis. (Fol. a7v)
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