# Equations of a circle

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• Equations of a Circle
• I am always willing to help
• I keep forgetting that you need to write the opposite of the center of the circle in the equation when you write it out
• Equations of a Circle
• It's simple!  Whatever symbol the center numbers have, in the equation you would make the positives, negative and the negatives, positives
• Equations of a Circle
• I will give an example
• Ok, What is the center and the radius?
• Center: (-12, 11) Radius: 4
• Johnny  & Mrs. Sauders
• Equations of a Circle
• Johnny & Mrs. Saunders
• Equations of a Circle
• Not quite! You have to remember that you need to square the radius in the equation and also the center point needs to be opposite in the equation!!
• (x+12)^2 + (y-11)^2 = 16
• Johnny & Mrs. Saunders
• Equations of a Circle
• YAY, That's Correct!!!
• OK, this is all great but can you help me now?
• Johnny, Zoey, and Joey
• Me either I need help
• (x-12)^2 + (y+11)^2= 4
• Is this correct?
• I Have no clue how to do any of this!!!
• Johnny &  Mrs. Saunders
• I will give you one more
• Oh I understand now!
• Johnny, Joey, and Mrs. Saunders
• YAY, I finally understand! thank you for helping me
• (x+13)^2 + (y+5)^2 = 9
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