Equations of a circle

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
  • What about the radius?
  • 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 
  • The correct answer
  • 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
  • center: (-13,-5) Radius: 3
  • 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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