A handful of unequivocal typographical errors has been corrected. For increased clarity, a few diagrams have been shifted from their original position in the text. Images for sections of the text where the :ratio and ?proportion symbols occur. - [i] P'Q':PQ?ST:DTReturn to text
- [ii] AT : aT ? BT : bTReturn to text
- [iii] AC : ac ? BC' : deReturn to text
- [iv] ac : bc' ? aV : bVReturn to text
- [v] de : bc' ? dT : bTReturn to text
- [vi] ?aV : bV ? dT : bTReturn to text
- [vii] ?aR : TV ? ab : bVReturn to text
- [viii] ?aR' : MV ? ab : bVReturn to text
- [ix] aR : TV ? ab : bV— ?aR' : MV ? aR : TVReturn to text
- [x] eb : ef ? EB : AEReturn to text
- [xi] eb : ef ? PV : VTReturn to text
- [xii] PV : VT ? EB : AEReturn to text
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