Menelaus' theorem(redirected from Menelaus's theorem)
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Menelaus' theorem[¦men·ə¦lā·əs ‚thir·əm]
If ABC is a triangle and PQR is a straight line that cuts AB, CA, and the extension of BC at P, Q, and R respectively, then (AP / PB)(CQ / QA)(BR / CR) = 1.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.