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iheartfood

  • 3 years ago

Which of the following could be points on the unit circle? (answer choices attached!) ***CHOOSE ALL THAT APPLY!!!!

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  1. iheartfood
    • 3 years ago
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    answer choices A,B,C,D from top to bottom... im not really sure on this one... pls explain! thanks! :) ***choose ALL that apply :)

  2. iheartfood
    • 3 years ago
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    thanks for coming :) do y'all get this one?

  3. mathstudent55
    • 3 years ago
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    The equation of the unit circle is x^2 + y^2 = 1 Any point that makes the equation true is a point on the unit circle.

  4. iheartfood
    • 3 years ago
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    okay lemme try plugging em in... one sec!

  5. iheartfood
    • 3 years ago
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    i tried the first one and it didn't work...... i got 1.34... did i do that right?? so A is WRONG right? :)

  6. iheartfood
    • 3 years ago
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    and for the second choice, i got 1.4444444... so that's wrong also right?

  7. iheartfood
    • 3 years ago
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    but (1,1) =1 when i plug in so C is an answer right?! :)

  8. mathstudent55
    • 3 years ago
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    Try the second one again.

  9. iheartfood
    • 3 years ago
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    and for the last one, i got .28... so that's wrong right?? D is NOT an answer right?

  10. mathstudent55
    • 3 years ago
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    (1, 1) x^2 + y^2 = 1 1^2 + 1^2 = 1? 1 + 1 = 1 Not true, so (1, 1) is not a point on the unite circle.

  11. iheartfood
    • 3 years ago
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    oh okay i did it again... i got 1 lol so B is an answer yes?

  12. mathstudent55
    • 3 years ago
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    You are doing your math wrong.

  13. mathstudent55
    • 3 years ago
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    Two work and two don't work.

  14. iheartfood
    • 3 years ago
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    ohhh and i see for C... lol my bad!!! :P so A and C are out... and B is an answer?

  15. iheartfood
    • 3 years ago
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    and lemme try D again... and D is 1 as well.. my bad.. i entered them all weird in my calc so everything was wrong.. my bad!!! LOL sorry bout that... so B and D are the answers?

  16. mathstudent55
    • 3 years ago
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    |dw:1361312285133:dw|

  17. mathstudent55
    • 3 years ago
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    |dw:1361312348159:dw|

  18. iheartfood
    • 3 years ago
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    i see.. so my answers are B and D then right??

  19. mathstudent55
    • 3 years ago
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    C doesn't work. I showed you above.

  20. mathstudent55
    • 3 years ago
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    Yes.

  21. iheartfood
    • 3 years ago
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    awesome! Thanks :)

  22. mathstudent55
    • 3 years ago
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    (0.8)^2 + (-0.6)^2 = 1? 0.64 + 0.36 = 1? 1 = 1 It works. D is true

  23. mathstudent55
    • 3 years ago
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    wlcm

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