Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 44, No. 2, pp. 339349 (2003) 

Well centered spherical quadranglesAna M. d'Azevedo Breda and Altino F. SantosDepartment of Mathematics, University of Aveiro, 3810  193 Aveiro, Portugal, email: ambreda@mat.ua.pt; Department of Mathematics, U.T.A.D., 5001  911 Vila Real, Portugal, email: afolgado@utad.ptAbstract: We introduce the notion of a well centered spherical quadrangle or WCSQ for short, describing a geometrical method to construct any WCSQ. We shall show that any spherical quadrangle with congruent opposite internal angles is congruent to a WCSQ. We may classify them taking in account the relative position of the spherical moons containing its sides. Proposition 3 describes the relations between well centered spherical moons and WCSQ which allow the refereed classification. Full text of the article:
Electronic version published on: 1 Aug 2003. This page was last modified: 4 May 2006.
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