Writing Equations of Circles Write the standard equation of the circle with a center at (-1.9, 8.7) and a radius of 3. (x – 2)2 + (y + 9)2 = 11 Write the standard equation of the circle with a center at (0, 6) and a radius of. Writing Equations of Circles Write the standard equation of the circlewith a center at (2, -9) and a radius of. (x – 4)2 + (y – 7)2 = 25 Write the standard equation of the circle with a center at (-3, 8) and a radius of 6.2 (x + 3)2 + (y – 8)2 = 38.44 Writing Equations of Circles Write the standard equation of the circle with a center at (4, 7) and a radius of 5. Graphing Circles (x – 5)2 + y2 = 36 Center (5, 0) Radius of 6 Graphing Circles (x + 4)2 + (y – 1)2 = 25 Center (-4, 1) Radius of 5 Graphing Circles (x – 3)2 + (y – 2)2 = 9 Center (3, 2) Radius of 3 The equation is x 2 + y 2 = 144įinding 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 Circle B The center is (4, 20) The radius is 10 The equation is (x – 4)2 + (y – 20)2 = 100 The equation of a circle in standard form is: (x – h)2 + (y – k)2 = r2įinding the Equation of a Circle Circle O The center is (0, 0) so it is located at the origin. Equation of A Circle Keystone Geometry Unit 7Įquation of a Circle The center of a circle is given by (h, k).

Equation of a circle