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A history of Greek mathematics - Wilbourhall.org

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:<br />

68 ARCHIMEDES<br />

Let QGO meet the original circle in P and AB in F.<br />

OFPG is the straight line required.<br />

For<br />

But<br />

whence<br />

CG.GT=OG.GQ = OG. BK.<br />

OF:OG = BT: GT, by parallels,<br />

OF.GT=OG.BT.<br />

:<br />

OG Therefore CG . GT : OF . GT = OG . BK<br />

whence CG:OF= BK : BT<br />

= BG:OB<br />

= P

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