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moongazer Group Title

Why is it the sine of an angle is also equal to the sine of 180 minus that angle ? e.g. sin 45degrees = sin 135degrees

  • one year ago
  • one year ago

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  1. qpHalcy0n Group Title
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    Because the elevation of the inscribed triangle (to the unit circle) is still positive.

    • one year ago
  2. moongazer Group Title
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    I also noticed that.

    • one year ago
  3. qpHalcy0n Group Title
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    |dw:1348381225832:dw|

    • one year ago
  4. moongazer Group Title
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    but why "180 - angle", not "angle - 180"

    • one year ago
  5. qpHalcy0n Group Title
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    Well, in the given example. If angle = 45, then 45 - 180 = -90. sin(-90) is not equal to sin(45)

    • one year ago
  6. qpHalcy0n Group Title
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    Sorry, the calculation was wrong there. 45 - 180 = -135. But the same applies, sin(-135) is not equal to sin (45)

    • one year ago
  7. qpHalcy0n Group Title
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    It would have the same *magnitude* but not the same *sign*.

    • one year ago
  8. moongazer Group Title
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    I already understand that the value of sine in Q1 is also equal to the sine in Q2. but where did you get the 180- angle like how did you get the lwh for volume

    • one year ago
  9. qpHalcy0n Group Title
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    Well, volume doesn't come into question here. But it's a simple matter of the definition of the "sine" function. 180 - 45 = 135, and when you have 45 and 135....the inscribed triangle's elevation is equal in both magnitude and sign.

    • one year ago
  10. qpHalcy0n Group Title
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    If you go the other direction, you get opposed angles (pointing opposite directions). So you'll get an elevation equal in magnitude but NOT equal in sign.

    • one year ago
  11. moongazer Group Title
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    ohh ok thanks :)

    • one year ago
  12. qpHalcy0n Group Title
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    np.

    • one year ago
  13. moongazer Group Title
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    so "sin(180-angle)" is equal to "angle" because "180-angle" always give an angle that is equal to the sine of the "angle". is it like that ?

    • one year ago
  14. moongazer Group Title
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    @qpHalcy0n

    • one year ago
  15. qpHalcy0n Group Title
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    Well, because the way sine is DEFINED. Remember SOHCAHTOA. Sin = Opp/Hyp Hypotenuse is always positive. So you're looking at the opposite leg of a triangle. The elevations must both have the same sign, if they do not...then the sine's will not match.

    • one year ago
  16. moongazer Group Title
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    ok, thanks again :)

    • one year ago
  17. qpHalcy0n Group Title
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    np.

    • one year ago
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