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shelby1290

  • one year ago

Determine the radius and the center of the following circles. Round to the nearest tenth. a) x^2 + y^2 = 81 radius= ? center=? b) x^2 + y^2 = 1 radius= ? centre= ?

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  1. jim_thompson5910
    • one year ago
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    |dw:1434503664766:dw|

  2. jim_thompson5910
    • one year ago
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    the original x and y can be written as (x-0) and (y-0) |dw:1434503681112:dw|

  3. jim_thompson5910
    • one year ago
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    81 is the same as 9^2 |dw:1434503731384:dw|

  4. jim_thompson5910
    • one year ago
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    |dw:1434503759321:dw|

  5. jim_thompson5910
    • one year ago
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    compare that to \(\Large (x-h)^2 + (y-k)^2 = r^2\) |dw:1434503785488:dw|

  6. jim_thompson5910
    • one year ago
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    |dw:1434503824871:dw|

  7. jim_thompson5910
    • one year ago
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    Hopefully all that makes sense?

  8. shelby1290
    • one year ago
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    @jim_thompson5910 yea it makes sense but which one is the centre?

  9. jim_thompson5910
    • one year ago
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    (h,k) is the center r is the radius

  10. jim_thompson5910
    • one year ago
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    |dw:1434503924630:dw|

  11. shelby1290
    • one year ago
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    alright

  12. shelby1290
    • one year ago
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    and for part b you can't square 1 so what do you do ?

  13. jim_thompson5910
    • one year ago
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    yes you can, 1 = 1^2

  14. shelby1290
    • one year ago
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    ohhh yea

  15. shelby1290
    • one year ago
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    i'm going to try part by myself and then you can check it over for me

  16. jim_thompson5910
    • one year ago
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    sure

  17. shelby1290
    • one year ago
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    |dw:1434504154480:dw|

  18. shelby1290
    • one year ago
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    |dw:1434504263508:dw|

  19. shelby1290
    • one year ago
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    @jim_thompson5910 ^

  20. jim_thompson5910
    • one year ago
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    very nice you have the correct steps, center and radius

  21. shelby1290
    • one year ago
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    thanks for the help!

  22. jim_thompson5910
    • one year ago
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    you're welcome

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