Trigonometry

• Cosine Rule


  a^2 = b^2 + c^2 - 2bcCos(A)
• Opposite


  Side opposite an angle
• Adjacent


  Side next to an angle
• Solving for x


  1. Label the lengths

  2. Put into the equation

  3. Put into calculator

  4. Square root it
• Sine Rule


  Sin A/a = Sin B/b = Sin C/c
• Solving for side using Sine Rule


  1. Label the lengths

  2. Put into equation

  3. Multiply by denominator of angle we are trying to find

  4. Take the sine of the answer
• Tangent


  Opposite / Adjacent
• Cosine


  Adjacent / Hypotenuse