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90.75 Some thoughts on the neglected quadrilateral

Published online by Cambridge University Press:  01 August 2016

J. A. Scott
J. A. Scott*
Affiliation:
1 Shiptons Lane, Great Somerford, Chippenham SN15 5EJ
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Type
Notes
Information
The Mathematical Gazette , Volume 90 , Issue 519 , November 2006 , pp. 483 - 485
Copyright
Copyright © The Mathematical Association 2006

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References

1. Hobson, E.W., A treatise on plane and advanced trigonometry, Dover (1957) p. 204.Google Scholar
2. Bretschneider, C.A., Untersuchung der trignometrischen Relationen des geradlinigen Viereckes, Archiv der Math. 2 (1842) pp. 225–261.Google Scholar
3. Ivanoff, V.F., Solution to problem E1376: Bretschneider’s formula, Amer. Math. Monthly 46 (1960) pp. 291–292.Google Scholar