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MrNood
 one year ago
Best ResponseYou've already chosen the best response.0dw:1434483822391:dw first calculate the radius using pythagoras

MrNood
 one year ago
Best ResponseYou've already chosen the best response.0the equation for a circle is (xa)^2 +(yb)^2 = r^2 so maybe just working out r^2 from the diagram would help...

MrNood
 one year ago
Best ResponseYou've already chosen the best response.0in 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
 one year ago
Best ResponseYou've already chosen the best response.0I'm confused, would it be B?

MrNood
 one year ago
Best ResponseYou've already chosen the best response.0I'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
 one year ago
Best ResponseYou've already chosen the best response.0How do I calculate r^2?

MrNood
 one year ago
Best ResponseYou've already chosen the best response.0dw: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
 one year ago
Best ResponseYou've already chosen the best response.0I get (x+4)2+(y+3)2=125

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So it would be D, correct?
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