Full text: Libri I - III (1)

ELEMENTORUM 
362 
Kal ével ioor zuxlor sioig, loat sioi nai ai en 
gýv rěvroov dbo ôy ai BK, KI §vol rois EA, 
AZ loai sioi, nai Baois y BI Sáosi vý EZ loy 
rovia doc y vno BKI jovia vý vnò EAZ loy 
koriv. Ai de loci poviai àari lowv neoipegeiwv Be 
Graaoiv, ovov noòg voig névroois boiv lon doe 
BHT reoigéoeie  EZ neoipegeig. "Eovi de 
zci olos o ABI иаlos оlo t EZ rl loos 
nai douny doc ý BAI reolloa lly t Etz 
eorgpegeie lon koriv. Ev doa vois looig, nal ve 
6518. 
IIPOTA2I2 29. 
Ev vois looig nozloig dxò règ loag veoupegeies 
ioai sUOslai Vnovsivovoiy. 
EovWocy loot zvzhot ot ABT, AEZ, aal &y 
avvois loai negioigeiai dnetlidwoay al BHT, 
EOZ, zol èusgevydooav al BI, EZ evdelat Aéyo 
ori loy čoriv y BI eddeia vy EZ. 
Eidmodo yao rå zévroc róy zuthov, v& K, A, 
nal enegevgdooav dl BK, KT, EA, AZ. 
tactum 4 recta 4A perpendicularis est ad tangentem (III. 18.). 
At ductis AB, AT, in triangulis 4BO, 410 est AB—AT, et 
40 communis, et ob arcus AB, Ar ex hyp. aequales, angu 
lus BAO—T40 (III. 27.), itaque B04=194 (I. 4.), proinde 
uterque rectus est (I. 13.); itaque reçta EZ parallela erit 
rectae BI (I. 28.). Hinc simul patet, rectami, quae e centro 
circuli ducta arcum circuli bifariam secat, secare etiam rectam 
illi arcui subtensam bifariam et ad angulos rectos. 
Cor. 7. Conversa quoque antecedentis corollarii facile 
demonstrabitur: nempe, si recta EZ, quae ex medio peri 
pheriae alicuius ducitur, parallela est rectae lineae, quae il¬
	        
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