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A history of Greek mathematics - Wilbourhall.org

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#<br />

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;<br />

THE CONICS, BOOK VII 171<br />

But A'Q*:A'M.MH'= AA'.AH' (VII. 2, 3)<br />

= AA':A'H<br />

= A'M. AA': A'M. A'H,<br />

so that, alternately,<br />

A'M. AA': A'Q = 2 A'M. A'H : A'M<br />

= A'H:MH'.)<br />

Next, PP' 2 : DD'<br />

.<br />

ME<br />

2 = MH': MH, as above, (0)<br />

= MH' 2 :MH.MH',<br />

whence PP': DD' = ikf^T r :

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