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... than the other side, an obtuse-angled ; and if greater, an acute-angled cone. XIX. The axis of a cone is the fixed straight line about which the triangle revolves. XX. The base of a cone is the circle described by that side containing the right angle,...
Euclide's Elements: The Whole Fifteen Books Compendiously Demonstrated: with ... - Σελίδα 197
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...it be leflej it is an obtult-anglcd Conej if greater, an acute- angled Cone. XI XThe Axis of a Gone is that fix'd line about which the triangle is moved. , XX. The 17о rbeelevtntb tt : Г." — X X.The Bafe of a Cone is the cjrcje,which ц defcribcd by the tight...

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