The Online Books Page

Plane trigonometry

See also what's at your library, or elsewhere.

• Trigonometry

• Trigonometry, Plane

• Plane and Spherical Trigonometry With Applications (Boston: D. C. Heath and Co., c1943), by William L. Hart (page images at HathiTrust)

Items below (if any) are from related and broader terms.

• Plane and Spherical Trigonometry (Boston: Ginn and Company, c1915), by George Wentworth and David Eugene Smith, contrib. by G. A. Wentworth (PDF at djm.cc)
• Trigonometry (New York: Macmillan, 1914), by Alfred Monroe Kenyon and Louis Ingold (multiple formats at Google)
• Elements of Geometry and Trigonometry, by A. M. Legendre and Charles Davies, ed. by J. Howard Van Amringe (page images at Cornell)
• Precalculus (with predecessor and related titles), by Carl Stitz and Jeff Zeager (PDF files with commentary at stitz-zeager.com)
• Napier Tercentenary Memorial Volume, ed. by Cargill Gilston Knott (page images at Cornell)

• Plane and Spherical Trigonometry With Applications (Boston: D. C. Heath and Co., c1943), by William L. Hart (page images at HathiTrust)

• CK-12 Trigonometry (second edition, c2011), by Art Fortgang, Andrea Hayes, Lori Jordan, Mara Landers, Brenda Meery, and Larry Ottman (multiple formats at archive.org)
• Trigonometry (electronic edition, 2013 or later), by Michael Corral (PDF with commentary at mecmath.net)

• Spherical Trigonometry, for the Use of Colleges and Schools (fifth edition, 1886), by I. Todhunter (page images at Cornell)
• Plane and Spherical Trigonometry With Applications (Boston: D. C. Heath and Co., c1943), by William L. Hart (page images at HathiTrust)
• Geometria e Trigonometria della Sfera (in Italian; Milan: U. Hoepli, 1900), by Cristoforo Alasia (page images at HathiTrust; US access only)