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stupidinmath

  • 2 years ago

what is the circumference of the circle x^2+y^2-10y-36=0? a. 38 b. 49 c. 54 d. 125 e. 192

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  1. hartnn
    • 2 years ago
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    so you need radius right ? i think you know how to find Circumference from radius

  2. hartnn
    • 2 years ago
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    heard about completing the square ?

  3. hartnn
    • 2 years ago
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    y^2 -10y +a can you find 'a' such that y^2-10y +a is a perfect square ?

  4. dpasingh
    • 2 years ago
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    Hi @hartnn if you allow me, i complete the answer..

  5. hartnn
    • 2 years ago
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    sure, go ahead :)

  6. hartnn
    • 2 years ago
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    y^2 -10y +a can you find 'a' such that y^2-10y +a is a perfect square ?

  7. stupidinmath
    • 2 years ago
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    sqrt of 10?

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