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Introduction to Trigonometry

Checkpoint: ratios, flips and one fold

Five questions on the first five lessons. Retry as often as you like.

A right triangle has opposite 6, adjacent 8, hypotenuse 10. What is sin A?

A 3-4-5 triangle is scaled to 6-8-10. Angle A is opposite the side 3. What happens to cos A?

A triangle gives sin A = 5/13. What is cosec A?

What is tan 90°?

A square is folded along its diagonal. What is sin 45°?

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This track

  1. 0 Start here
  2. 1 Naming the ratios
  3. 2 The angle owns the ratios
  4. 3 The flipped ratios
  5. 4 The flat end and the upright end
  6. 5 Forty-five degrees, folded from a square
  7. 6 Checkpoint: ratios, flips and one fold
  8. 7 Thirty and sixty, cut from an equilateral
  9. 8 Quotients of quotients
  10. 9 Squared, then added
  11. 10 Checkpoint: values, relations and the identity
  12. 11 What the identity settles
  13. 12 The big picture
  14. 13 Track quiz

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