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anonymous

  • one year ago

Need help! http://puu.sh/irlmX/0902ab0982.png

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  1. anonymous
    • one year ago
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    I think it's A

  2. MrNood
    • one year ago
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    |dw:1434483822391:dw| first calculate the radius using pythagoras

  3. MrNood
    • one year ago
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    the equation for a circle is (x-a)^2 +(y-b)^2 = r^2 so maybe just working out r^2 from the diagram would help...

  4. MrNood
    • one year ago
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    in the equation above a and b are the x and y values for the centre so once you have worked out r^2 it will be easy to find the correct equation (it is not A)

  5. anonymous
    • one year ago
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    I'm confused, would it be B?

  6. MrNood
    • one year ago
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    I'm not going ot confoirm or deny a series of guesses use my circle diagram above, and use Pythagoras to work out the value of r^2

  7. anonymous
    • one year ago
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    How do I calculate r^2?

  8. MrNood
    • one year ago
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    |dw:1434484385823:dw| work out the length of the 2 black lines (the x and y difference in the 2 points) then use Pythagoras to find the length of the hypotenuse

  9. anonymous
    • one year ago
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    I get (x+4)2+(y+3)2=125

  10. anonymous
    • one year ago
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    So it would be D, correct?

  11. anonymous
    • one year ago
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    @MrNood

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