Beman, Wooster Woodruff, 1850-1922, Smith, David Eugene, 1860-1944 · Boston, Ginn & company · leaf 151
Fig. 7. Fig. 3 is a special case where P is at 0, and merely affirms thata central angle equals itself. Fig. 4 shows that prop. XI is a special caseof prop. XIV. Fig. 6 shows the same for prop. XIII. Corollary. 3. An angle formed by a secant and a tan-gent, or by two tangents, equals the difference…
Geometry
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