Smart, Edward Howard · London : Macmillian and Co. · leaf 206
(a) … Fig. 95. For if C be the centre and CN, On perpendicular to PQ, pq^AP = CN and aj) = Cn. .. CN = Cn and the chords QQ, qq are equal. .*. PQ and pq, being the differences between the halves ofthese chords and the radius, are equal to one another. Hence the application of the above definition gives a…
Geometry, Projective
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