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Equations of Circles

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Equation of a Circle The center of a circle is given by (h, k) The radius of a circle is given by r The equation of a circle in standard form is (x – h) 2 + (y – k) 2 = r 2

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Finding the Equation of a Circle Circle A The center is (16, 10) The radius is 10 The equation is (x – 16) 2 + (y – 10) 2 = 100

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Finding the Equation of a Circle Circle B The center is (4, 20) The radius is 10 The equation is (x – 4) 2 + (y – 20) 2 = 100

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Finding the Equation of a Circle Circle O The center is (0, 0) The radius is 12 The equation is x 2 + y 2 = 144

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Graphing Circles (x – 3) 2 + (y – 2) 2 = 9 Center (3, 2) Radius of 3

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Graphing Circles (x + 4) 2 + (y – 1) 2 = 25 Center (-4, 1) Radius of 5

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Graphing Circles (x – 5) 2 + y 2 = 36 Center (5, 0) Radius of 6

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Writing Equations of Circles Write the standard equation of the circle: Center (4, 7) Radius of 5 (x – 4) 2 + (y – 7) 2 = 25

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Writing Equations of Circles Write the standard equation of the circle: Center (-3, 8) Radius of 6.2 (x + 3) 2 + (y – 8) 2 = 38.44

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Writing Equations of Circles Write the standard equation of the circle: Center (2, -9) Radius of (x – 2) 2 + (y + 9) 2 = 11

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Writing Equations of Circles Write the standard equation of the circle: Center (0, 6) Radius of x 2 + (y – 6) 2 = 7

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Writing Equations of Circles Write the standard equation of the circle: Center (-1.9, 8.7) Radius of 3 (x + 1.9) 2 + (y – 8.7) 2 = 9

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