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Inverse Trigonometric Ratios

Solving for an angle given a trigonometric ratio.

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Practice Inverse Trigonometric Ratios
Estimated6 minsto complete
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Sine Cosine Tangent
Teacher Contributed

RWA Sine, Cosine, Tangent


The Earth, Moon and Sun


  • Sine
  • Cosine
  • Tangent
  • Trigonometric Ratios With a Calculator
  • Inverse Trigonometric Ratios

Student Exploration

How did the ancient Greek astronomers determine the size of and distance from the Earth, Moon, and Sun?

Watch the video to learn more:


Extension Investigation

Parallax - To Determine Stellar Distances

See how to duplicate their methods


Dialate a right Triangle


Layering (optional)

Trigonometric Parallax

Trigonometry in the real world

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