TRIGONOMETRY

TRIGONOMETRY

1. Angles of Elevation

2. Problems in Three Dimension

   • Step 1 : Redraw the triangle separately as a plain, right-angled triangle
     • Step 2 : Add the known and unknown values you want to find
       • Step 3 : Use trigonometric ratios and Pythagoras' theorem

3. Sine and Cosine of Obtuse Angles

   • - If angle(x) is obtuse then sin (x) = sin (180 - x )
   • - If angle(x) is obtuse cos (x) = -cos (180 - x )

4. The Sine Rule and Cosine Rule

5. Using Sine to Find the Area of a Triangle

6. Angles of Depression

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