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105.33 A property of bifocal conics, illuminated by Ptolemy’s theorem

Published online by Cambridge University Press:  21 June 2021

David Rose  and
Li Zhou
David Rose
Affiliation:
Polk State College, FL, USA e-mail: drose@tampabay.rr.com
Li Zhou
Affiliation:
Polk State College, FL, USA e-mail: lzhou@polk.edu
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The Mathematical Gazette , Volume 105 , Issue 563 , July 2021 , pp. 331 - 332
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Copyright
© Mathematical Association 2021

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References

Apollonius of Perga, Treatise on Conic Sections, edited by Heath, T. L., Cambridge University Press (1896), available at https://ia802707.us.archive.org/9/items/treatiseonconics00apolrich/treatiseonconics00apolrich.pdf Google Scholar
Gutenmacher, V. and Vasilyev, N. B., Lines and Curves, Birkhäuser (2004).CrossRefGoogle Scholar
https://www.cut-the-knot.org/Curriculum/Geometry/ProductInEllipse.shtml#Explanation Google Scholar
Salmon, G., A treatise on conic sections (6th edn.), Chelsea (1960). 10.1017/mag.2021.76 Google Scholar