reciprocal theorem

reciprocal theorem

[ri′sip·rə·kəl ′thir·əm]
(mathematics)
In plane geometry, a theorem (which may be true or false) that is obtained from a given theorem by exchanging points and lines, angles and sides, and so forth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.