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(h,k) (-3, 7) center r ( ( ( +3)2+( -7)2 = (x+3)2 +(y-7)2 = The CENTER, represented by point (h,K) is where the LEFT side of the equation is equal to zero. Example below: (0)2 + (0)2 = -3 Horizontal change x-h ) ) 2 2 + + ( ( Vertical change y-k 7 ) ) 2 2 = = radius2 r2 r2 r2 r2 What x and y values make the left side of the equation equal zero? What is the center of the circle? What is the radius of the circle? r2 (x+2)2 +(y-5)2 =16 =16, use square roots to find r. ( , ) What x and y values make the left side of the equation equal zero? What is the center of the circle? What is the radius of the circle? r2 (x+7)2 +(y+5)2 =16 =16, use square roots to find r. ( , ) What x and y values make the left side of the equation equal zero? What is the center of the circle? What is the radius of the circle? r2 (x+12)2 +(y+35)2 =16 =16, use square roots to find r. ( , ) What x and y values make the left side of the equation equal zero? What is the center of the circle? What is the radius of the circle? r2 (x-6)2 +(y-8)2 =25 =25, use square roots to find r. ( , ) What x and y values make the left side of the equation equal zero? What is the center of the circle? What is the radius of the circle? r2 (x+2)2 +(y-5)2 =36 =36, use square roots to find r. ( , ) What x and y values make the left side of the equation equal zero? What is the center of the circle? What is the radius of the circle? r2 x2 +(y-22)2 =9 =9, use square roots to find r. ( , ) What x and y values make the left side of the equation equal zero? What is the center of the circle? What is the radius of the circle? r2 x2 +y2 =121 =16, use square roots to find r. ( , ) What x and y values make the left side of the equation equal zero? What is the center of the circle? What is the radius of the circle? r2 (x+13)2 +(y-1)2 =64 =16, use square roots to find r. ( , ) What is the radius of the circle? What x and y values make the left side of the equation equal zero? r2 What is the center of the circle? (x+13)2 +(y-1)2 = =25/9, find the square roots of numerator and denominator SEPARATELY to find r. ( , 25 ) 9 What is the radius of the circle? What x and y values make the left side of the equation equal zero? r2 What is the center of the circle? (x+3)2 +(y)2 = =25/9, find the square roots of numerator and denominator SEPARATELY to find r. ( , 49 81 ) |