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69. In a spherical quadrangle the arcs joining the mid-points of the three pairs of opposite sides are concurrent

Published online by Cambridge University Press:  03 November 2016

J. C. Palmer
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Abstract

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Type
Mathematical Notes
Information
The Mathematical Gazette , Volume 1 , Issue 16 , February 1899 , pp. 231 - 232
Copyright
Copyright © Mathematical Association 1899

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References

* Not shown in the figure.

† Or this may be inferred from the fact that the diameters P 1 ′P 1, P 2 ′P 2, P 3 ′P 3, are respectively parallel to the chords BC, CA, AB, and are therefore in a plane parallel to the plane ABC.