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Mathematical Education, 2021, Issue 1(97), Pages 2–4 (Mi mo734)  
Students and teachers of secondary school

From equality of Pythagoras to equality of Ptolemy

V. K. Gavrilov
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Abstract: For a quadrilateral inscribed in a circle, the connection between Ptolemy's equality and the equality of Pythagoras is noted. A formula is obtained for the ratio of the diagonals of the quadrilateral, the lengthes of the diagonals are determined.
Document Type: Article
UDC: 514.112.4
Language: Russian
Citation: V. K. Gavrilov, “From equality of Pythagoras to equality of Ptolemy”, Math. Ed., 2021, no. 1(97), 2–4
Citation in format AMSBIB
\Bibitem{Gav21}
\by V.~K.~Gavrilov
\paper From equality of Pythagoras to equality of Ptolemy
\jour Math. Ed.
\yr 2021
\issue 1(97)
\pages 2--4
\mathnet{http://mi.mathnet.ru/mo734}
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