Trigonometry

Trigonometry Functions

When determining the designate angle we can use different ratios of sides.

  • We can use a ratio of the opposite to the hypotenuse.
  • We can use a ratio of the adjacent to the hypotenuse.
  • We can use a ration of the opposite to the adjacent.

Each ratio has a trigonometric function that helps turn the ratio into an angle.  They are:

  • sin θ = opposite/hypotenuse
  • cos θ = adjacent/hypotenuse
  • tan θ = opposite/adjacent

One way of remembering the ratios are these mnemonics:

  • SOH – Sine is opposite/ hypotenuse
  • CAH – Cosine is adjacent/hypotenuse
  • TOA – Tangent is opposite/ adjacent

By the way,

  • sin is short for sine
  • cos is short for cosine
  • tan is short for tangent

Video!

This video walks through how to determine the angle of a right triangle when you have two sides.

 

Video!

This video walks through how to determine the other sides of a triangle when you have an angle and one side.

Attributions

Trigonometry (Part one).video by The Electric Academy is under a Creative Commons Attribution Licence.

Trigonometry (Part two).video by The Electric Academy is under a Creative Commons Attribution Licence.

 

License

Icon for the Creative Commons Attribution 4.0 International License

Trigonometry Functions by BCIT is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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