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103.09 On the heights of a convex quadrilateral

Published online by Cambridge University Press:  14 February 2019

Martin Josefsson
Martin Josefsson*
Affiliation:
Västergatan 25d, 285 37 Markaryd, Sweden e-mail: martin.markaryd@hotmail.com
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Type
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Information
The Mathematical Gazette , Volume 103 , Issue 556 , March 2019 , pp. 145 - 150
Copyright
Copyright © Mathematical Association 2019 

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References

1. Donaire, M., Teorema para calcular el área de un cuadrilátero, 2018, http://personal.us.es/rbarroso/trianguloscabri/sol/sol867mil.pdfGoogle Scholar
2. Sauvé, L., Editor's comment, Crux Mathematicorum 3 (7) (August- September 1977) pp. 193–195, https://cms.math.ca/crux/backfile/Crux_v3n07_Aug.pdfGoogle Scholar
3. Josefsson, M., Similar metric characterizations of tangential and extangential quadrilaterals, Forum Geom. 12 (2012) pp. 63–77.Google Scholar
4. Josefsson, M., Further characterisations of tangential quadrilaterals, Math. Gaz. 101 (November 2017) pp. 401–411.10.1017/mag.2017.122Google Scholar