Trigonometry with right triangles (copied from Khan Academy)

Introduction to the trigonometric ratios

Learn what sine, cosine, and tangent are.

• Opposite, adjacent, and hypotenuse (sides of right triangles)(Article)
• Introduction to the trigonometric ratios(Video)
• Finding trig ratios in right triangles(Article)
• How to find trigonometric ratios in a right triangle (examples)(Video)
• Find trigonometric ratios in right triangles(Exercise)

Solving for a side in a right triangle using the trigonometric ratios

Learn how to find a side length in a right triangle when given one side length and one acute angle.

• Finding an unknown side in a right triangle using trigonometry(Article)
• How to find missing sides in a right triangle using trigonometry (example)(Video)
• Solve for a side in a right triangle