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babydoll332 Group Title

Evaluate sec 240° without using a calculator by using ratios in a reference triangle.

  • one year ago
  • one year ago

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  1. butterflyprincess Group Title
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    unit circle??

    • one year ago
  2. babydoll332 Group Title
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    with outt it

    • one year ago
  3. hartnn Group Title
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    ok, u know what is cos 60 ?

    • one year ago
  4. babydoll332 Group Title
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    pi/3

    • one year ago
  5. hartnn Group Title
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    cos pi/3 = ?

    • one year ago
  6. babydoll332 Group Title
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    60

    • one year ago
  7. hartnn Group Title
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    lol! 60=pi/3 cos 60 = 0.5 ok ?

    • one year ago
  8. babydoll332 Group Title
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    ohh ok

    • one year ago
  9. hartnn Group Title
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    sec 240 = 1/ cos 240 cos 240 = cos (180+60) cos (180+x) = -cos x now try

    • one year ago
  10. babydoll332 Group Title
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    what should i try im a lilttle confused

    • one year ago
  11. hartnn Group Title
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    cos (180+x) = -cos x so cos 240 = -cos 60 = -0.5 got this ?

    • one year ago
  12. babydoll332 Group Title
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    i think so

    • one year ago
  13. hartnn Group Title
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    now sec 240 =1/ cos 240 = 1/(-0.5) = -2 ok ?

    • one year ago
  14. babydoll332 Group Title
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    why did u use cos 60 though?

    • one year ago
  15. ByteMe Group Title
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    60 degrees is the reference angle for 240 degrees

    • one year ago
  16. hartnn Group Title
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    because cos 60 is known 60 is standard angle in unit circle

    • one year ago
  17. babydoll332 Group Title
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    ok

    • one year ago
  18. hartnn Group Title
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    any more doubts ?

    • one year ago
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