Cyclopædia
Assuming ellipse is required, the following result was found.
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ACUTEhttps://chambers.encyclo.eu/index.php/unclassified/ACUTE
the Triangle ACB, (Tab. Geometry, Fig, 68.)Acute-Angular Section, of a Cone, was used by the ancientGeometricians for the Ellipse. See Ellipse, andCone. Acute, in Music, is understood of a Sound, or Tonewhich is sharp, or shrill, or high, in respect of...
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