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babydoll332

  • 3 years ago

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

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  1. butterflyprincess
    • 3 years ago
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    unit circle??

  2. babydoll332
    • 3 years ago
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    with outt it

  3. hartnn
    • 3 years ago
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    ok, u know what is cos 60 ?

  4. babydoll332
    • 3 years ago
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    pi/3

  5. hartnn
    • 3 years ago
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    cos pi/3 = ?

  6. babydoll332
    • 3 years ago
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    60

  7. hartnn
    • 3 years ago
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    lol! 60=pi/3 cos 60 = 0.5 ok ?

  8. babydoll332
    • 3 years ago
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    ohh ok

  9. hartnn
    • 3 years ago
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    sec 240 = 1/ cos 240 cos 240 = cos (180+60) cos (180+x) = -cos x now try

  10. babydoll332
    • 3 years ago
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    what should i try im a lilttle confused

  11. hartnn
    • 3 years ago
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    cos (180+x) = -cos x so cos 240 = -cos 60 = -0.5 got this ?

  12. babydoll332
    • 3 years ago
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    i think so

  13. hartnn
    • 3 years ago
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    now sec 240 =1/ cos 240 = 1/(-0.5) = -2 ok ?

  14. babydoll332
    • 3 years ago
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    why did u use cos 60 though?

  15. ByteMe
    • 3 years ago
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    60 degrees is the reference angle for 240 degrees

  16. hartnn
    • 3 years ago
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    because cos 60 is known 60 is standard angle in unit circle

  17. babydoll332
    • 3 years ago
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    ok

  18. hartnn
    • 3 years ago
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    any more doubts ?

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