Trigonometric Ratios of Obtuse Angles



Below shows ∠DAC.

You can shift the point C to change the size of ∠DAC.


Instructions:
  1. Adjust the size of ∠DAC.
  2. Check the boxes.
  3. Observe the values of the trigonometric functions: \(\sin \theta \), \(\cos \theta \) and \(\tan \theta \).
  4. Observe the values of the trigonometric functions: \(\sin \left( {180^\circ - \theta } \right)\), \(\cos \left( {180^\circ - \theta } \right)\) and \(\tan \left( {180^\circ - \theta } \right)\).
  5. Repeat steps 1 ~ 4 for other sizes of ∠DAC.

Supplementary Angles: Angles that add up to \({180^\circ }\).




Download the GeoGebra file: http://www.geogebratube.org/material/download/format/file/id/44998

Download the GeoGebra Worksheet: http://db.tt/3guaUADv

Download the Worksheet: http://db.tt/6MFfkRFB

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