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anonymous

  • one year ago

Which of the following points lies on the circle whose center is at the origin and whose radius is 5? A.) (-3, 4) B.) (1, -2) C.) (√5,√5 )

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  1. anonymous
    • one year ago
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    the equation of a circle centered at the origin with radius of r is \[x^2+y^2=r^2\] This circle's equation is \[x^2+y^2=5\] Which of the points makes that equation true?

  2. anonymous
    • one year ago
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    you actually have to plug the numbers in to find the answer

  3. anonymous
    • one year ago
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    i think i am doing it wrong

  4. anonymous
    • one year ago
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    what did you get for x² + y² when you put in (-3, 4)?

  5. anonymous
    • one year ago
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    |dw:1435248007654:dw|

  6. anonymous
    • one year ago
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    25

  7. anonymous
    • one year ago
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    ok. that's not 5, so (-3,4) isn't the answer. Try (1, -2)

  8. anonymous
    • one year ago
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    5

  9. anonymous
    • one year ago
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    right. so (1, -2) is the answer since it gives 5 on the left to match the 5 on the right

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