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anonymous

  • 5 years ago

how do you write the equation of a circle with given center and radius

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  1. anonymous
    • 5 years ago
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    (x-a)^2 + (y-b)^2 = r^2 Where r = radius, (a,b) = centre co-ordinates

  2. anonymous
    • 5 years ago
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    thanks can you show me an example

  3. anonymous
    • 5 years ago
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    (x-2)^2 + (y+3)^2 = 25 Is a circle, centre (2,-3), radius 5

  4. anonymous
    • 5 years ago
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    (x^2-4x+4)+(y^2+6x+9)=25 what next!

  5. anonymous
    • 5 years ago
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    6x most be 6y

  6. anonymous
    • 5 years ago
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    You could bring all the constants, on to the right and side, but the form I gave it in in generally what is needed, and the simplest (if you want cartesian, that is)

  7. anonymous
    • 5 years ago
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    You just have to factor those two terms and you will get it back into the above form

  8. anonymous
    • 5 years ago
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    OK. well I'm a cape student but my teacher is holding back and the time is going so im going ahead by my self

  9. anonymous
    • 5 years ago
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    That sounds like fun.

  10. anonymous
    • 5 years ago
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    yea its fun but difficult at times

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