Lesson 2: The Sine and Cosine Ratios - Summary

   Summary

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Review what you have learned prior to completing the Lesson Assignment.

Key Ideas

  • \(\text{sine of angle}\,\theta=\frac{\color{blue}{\text{length opposite}\,\theta}}{\color{green}{\text{hypotenuse}}}\)

  • \(\text{cosine of angle}\,\theta=\frac{\color{red}{\text{length adjacent to}\,\theta}}{\color{green}{\text{hypotenuse}}}\)

  • Label the sides of the triangle with adjacent to, opposite and hypotenuse prior to deciding which trigonometric ratio to use.

Key Terms

  • sine
  • cosine
  • tangent
  • side adjacent to θ
  • side opposite θ
  • hypotenuse
  • trigonometry


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