Trigonometry (from the Greek trigonon="three angles" and metron=measure) is a branch of mathematics which deals with triangles, particularly triangles in a plane where one angle of the triangle is 90 degrees (right triangles). Triangles on a sphere are also studied, in spherical trigonometry. Trigonometry specifically deals with the relationships between the sides and the angles of triangles, that is, the trigonometric functions, and with calculations based on these functions.

Trigonometry has important applications in many branches of pure mathematics as well as of applied mathematics and, consequently, much of science. Trigonometry is usually taught in secondary schools, often in a precalculus course.

For a much more thorough overview of trigonometry, go to the Wikipedia article.

We carry very few materials that teach trigonometry, as many home schooled students end up taking this level of math at a college. What we have may be found here. If you would like a free online course introducing the topic, you can click here.

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 Algebra & Trigonometry: Functions & Applications - Set by Paul A. Foerster from Prentice Hall for 10th-12th grade in Algebra (Location: MATR-ALG) Algebra & Trigonometry: Functions & Applications - Teacher's Edition by Paul A. Foerster from Prentice Hall for 10th-12th grade in Algebra (Location: MATR-ALG) \$130.00 (1 in stock) Algebra 2 - Student Textbook 3rd edition from Bob Jones University Press for 11th grade in BJU Math (Location: MAT-BJU) \$68.89 \$41.00 (1 in stock) Algebra 2 - Student Textbook (old) 2nd edition from Bob Jones University Press for 11th grade in BJU Math (Old Versions only) (Location: OBJU-MAT) \$18.00 \$6.00 (2 in stock) Algebra 2 with Trigonometry - DVD from AskDrCallahan for 10th-12th grade in Trigonometry (Location: MATR-TRIG) \$145.00 Geometry - Student Textbook 4th edition from Bob Jones University Press for 10th grade in BJU Math (Location: MAT-BJU) \$68.89 \$42.00 (2 in stock) Life of Fred: Trigonometry Life of Fred by Stanley Schmidt Expanded Edition from Polka Dot Publishing for 10th-12th grade in Life of Fred Math (Location: MAT-FRED) \$49.00 Precalculus - Student Textbook 2nd edition from Bob Jones University Press for 12th grade in BJU Math (Location: MAT-BJU) \$68.89 Precalculus - Student Textbook (old) from Bob Jones University Press for 12th grade in BJU Math (Old Versions only) (Location: OBJU-MAT) \$25.00 Saxon Advanced Mathematics - Textbook by John Saxon 2nd edition from Saxon Publishers for 11th-12th grade in Saxon Math (Location: MAT-SAX) Trigonometry Flipper from Christopher Lee Publications for 11th-Adult in Trigonometry (Location: MATR-TRIG)