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Exercises on Euclid and in modern geometry for the use of schools, private students, and junior university students (1881)

McDowell, James L · Cambridge, Deighton, Bell, and Co. · leaf 171

An illustration from Exercises on Euclid and in modern geometry for the use of schools, private students, and junior university students, 1881, leaf 171
if we take AP as the linear unit, the reciprocal of ACis AD, of AB, AO and of AD, AC, and these reciprocals AD, AO,AC are obviously in arithmetical progression. 142 EXERCISES ON EUCLID [177. This property lias been already proved in (175), where it is2 1 1 expressed by AB AC + AD 177. If through a…

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