• Trigonometric Ratios

• Right Triangle Trigonometry

• Finding Side Lengths in Right Triangles

• More Practice Finding Side Lengths

• Finding Angles in Right Triangles

• Trigonometric Problem Solving

• Review

Trigonometry of Triangles

Right Triangles

A full set of lessons on SOH CAH TOA trigonometry as applied to right triangles, and additional rules that apply to non-right triangles. Also provides practice solving complex geometric problems.

Learn how to use sine, cosine, tangent to find sides and angles, and to solve geometric problems.

Non-Right Triangles

Learn how to use the sine & cosine rules and the area formula to solve right triangles and geometric problems.

• Area of a Triangle Using Sine

• Using the Sine Rule to Find Sides

• Using the Sine Rule to Find Angles

• The Cosine Rule

• Sine Rule and Obtuse Angles

• Sine Rule: Ambiguous Case

• Problem Solving with the Sine and Cosine Rules

• Problem Solving and Compass Bearings

• Applications of Trigonometry

• Trigonometry Review Level II