anonymous
  • anonymous
Need help! http://puu.sh/irlmX/0902ab0982.png
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
I think it's A
MrNood
  • MrNood
|dw:1434483822391:dw| first calculate the radius using pythagoras
MrNood
  • MrNood
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...

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MrNood
  • MrNood
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)
anonymous
  • anonymous
I'm confused, would it be B?
MrNood
  • MrNood
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
anonymous
  • anonymous
How do I calculate r^2?
MrNood
  • MrNood
|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
anonymous
  • anonymous
I get (x+4)2+(y+3)2=125
anonymous
  • anonymous
So it would be D, correct?
anonymous
  • anonymous
@MrNood

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