An elementary treatise on modern pure geometry (1893)
Lachlan, Robert · London, New York, Macmillan and Co. · leaf 42
is a harmonicrange. … Let 0 be the centre of the circle, and let 00 cut PQ in the point JWThen we have OR. 0S= 0P^= 0i\. 00. Therefore the points S, R, N, 0 areconcychc. But C is evidently the middle point of the arc SJVB; thereforeSO, J.VP bisect the angle SNR. Hence {OV, RS} is a harmonic range. 43. If [ABP] be any…
Geometry
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