Hajja, Mowaffaq A vector proof of a theorem of Bang. (English) Zbl 0994.51013 Am. Math. Mon. 108, No. 6, 562-564 (2001). The author gives a vector algebra proof of the following well-known fact: If any two of the facets of a tetrahedron have the same area, all four facets are congruent. Reviewer: O.Röschel (Graz) Cited in 3 Documents MSC: 51N20 Euclidean analytic geometry Keywords:tetrahedron; facets with the same area PDFBibTeX XMLCite \textit{M. Hajja}, Am. Math. Mon. 108, No. 6, 562--564 (2001; Zbl 0994.51013) Full Text: DOI