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| Title: | Mathematics at DEC |
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| Moderator: | RUSURE::EDP |
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| Created: | Mon Feb 03 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2083 |
| Total number of notes: | 14613 |
1795.0. "Crux Mathematicorum 1866" by RUSURE::EDP (Always mount a scratch monkey.) Mon Sep 20 1993 15:09
Proposed by Marcin E. Kuczma, Warszawa, Poland.
Perpendicular chords AC, BD of a given circle intersect in point J.
Let P, Q, R be the orthogonal projections of J onto segments AB, BC, CD
respectively and let N be the midpoint of AD. Prove that N, P, Q, R
are concyclic.
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