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Trigonometric Ratios of Obtuse Angles

Trigonometric Ratios of Obtuse Angles
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2018-07-03 14:35
AngleFunctionTrigonometry
This example demonstrates the trigonometric ratios of obtuse angles using the unit circle. It involves the concepts of trigonometric functions, angle measurement, and the unit circle. Using GeoGebra commands such as Point, OrthogonalLine, and Intersect, the construction of the sine, cosine, and tangent values of obtuse angles is illustrated. Suitable for high school mathematics education and learning.

GeoGebra Commands & Parameters

  1. Point(c) → A
  2. OrthogonalLine(A, xAxis) → a
  3. Intersect(a, xAxis) → B
  4. Segment(B, A) → Y
  5. Intersect(xAxis, yAxis) → C
  6. Segment(C, A) → R
  7. Segment(C, B) → X
  8. Distance(C, B) → CB
  9. Distance(A, B) → AB
  10. Intersect(c, xAxis, 2) → D
  11. Angle(D, C, A) → α