Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 237
a third wheel, £>, is used. We then have the case of tangents to three pairs of circles. Illustrations of this nature make the exercise on the drawing of common tangents to two circles assume an appearance of genuine reality that is of advantage to the work. … CHAPTER XVITHE LEADING PROPOSITIONS OF BOOK III In the American textbooks Book III is usually as-signed to proportion. It is therefore necessary at thebeginning of this discussion to consider what is meantby ratio and proportion, and to compare the ancient andthe modern theories. The subject is…
Geometry
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