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iheartfood

  • 3 years ago

sin(3pi/4)=_____ (answer choices attached inside!)

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  1. Hero
    • 3 years ago
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    Where are the attachments?

  2. iheartfood
    • 3 years ago
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    sorry right here haha :P answer choceis A,B,C,D from top to bottom :) **my answer: B. sq.rt 2/2 is that right? :)

  3. Hero
    • 3 years ago
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    Are you familiar with the unit circle?

  4. iheartfood
    • 3 years ago
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    yes.. its a circle with the radius of 1 right?

  5. Hero
    • 3 years ago
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    Yes, but we have to figure out the exact value. So, what I would do is convert radians to degrees first. If you let pi = 180, then you will have: sin(3(180)/4) = sin(3(45))

  6. Hero
    • 3 years ago
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    That's your hint.

  7. iheartfood
    • 3 years ago
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    ok... :)

  8. iheartfood
    • 3 years ago
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    and they both equal each other!! So is my answer B. then? :)

  9. Hero
    • 3 years ago
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    B is the correct answer, but how did you figure it out?

  10. iheartfood
    • 3 years ago
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    well i used ur hint and plugged it into my calc and they both had .088 as the result and laso b4 that, i did sin3pi/4and i just converted it :) hehe

  11. iheartfood
    • 3 years ago
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    thanks :)

  12. Hero
    • 3 years ago
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    The only thing you need to figure it out is a unit circle. \[\sin(135^{\circ}) = \frac{\sqrt{2}}{2}\]

  13. iheartfood
    • 3 years ago
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    ok.. thanks :)

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