Trigonometry Index

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

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Introduction

• The Triangle
• Triangle Inequality Theorem
• Interactive Triangles
• Introduction to Trigonometry

Sine, Cosine and Tangent

• 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
• Small Angle Approximations
• Inverse Sine, Cosine, Tangent

Right Angled Triangles

• Solving Triangles by Reflection
• Finding an Angle in a Right Angled Triangle
• Finding a Side in a Right Angled Triangle

Congruent and Similar

• Congruent Triangles
• Similar Triangles
• How to Find if Triangles are Similar
• Theorems about Similar Triangles
• Mean Proportional

Solving Triangles

• Solving Triangles
• The Law of Sines
• The Law of Cosines
• The Three Angles Add to 180°
• Exterior Angle Theorem
• Solving AAA Triangles
• Solving AAS Triangles
• Solving ASA Triangles
• Solving SAS Triangles
• Solving SSA Triangles
• Solving SSS Triangles

• Triangle Solving Practice

Area

• Area of a Triangle
• Heron's Formula

Identities

• Trigonometric Identities
• Magic Hexagon
• Triangle Identities