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<p>Book digitized by Google from the library of the New York Public Library and uploaded to the Internet Archive by user tpb.
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<br>Subjects: equal; angle; angles; sides; triangle; triangles; perpendicular; polygon; parallel; plane; infinitely small; regular polygon; spherical triangle; parallel lines; regular polygons; equal distances; convex surface; solid angle; plane angles; oblique lines</div>
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Benjamin Peirce</div>
Internet Archive identifier