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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
Abstract
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- Mathematical Notes
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- Copyright © Mathematical Association 1899
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.