Trigonometry Index

Trigonometry (from Greek trigonon "triangle" + metron "measure")

Want to Learn Trigonometry? Here are the basics!
Follow the links for more.

The Triangle

Interactive Triangles

Introduction to Trigonometry

Sine, Cosine and Tangent

Sohcahtoa

Sine Graph Exercise

Graphs of Sine, Cosine and Tangent

Unit Circle

Interactive Unit Circle

Sine, Cosine and Tangent in Four Quadrants

Inverse Sine, Cosine, Tangent

Solving Triangles by Reflection

Finding an Angle in a Right Angled Triangle

Finding a Side in a Right Angled Triangle

The Law of Sines

The Law of Cosines

The three angles add to 180°

Area of a Triangle without a Right Angle

Heron's Formula

Congruent Triangles

Similar Triangles

Solving Triangles

Solving AAA Triangles

Solving AAS Triangles

Solving ASA Triangles

Solving SAS Triangles

Solving SSA Triangles

Solving SSS Triangles

Triangle Solving Practice

Theorems about Similar Triangles

Trigonometric Identities

Magic Hexagon

Triangle Identities