9.3 Quiz - Equation of Circles

Which equation is the standard equation of a circle?

• (x - h)² + (y - k)² = r²

• (x + h)² + (y + k)² = r²

• (x - h)² - (y - k)² = r²

• (x - h)² + (y - k)² = r

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• Center: (16, -14) Radius: 9

• Center: (16, -14) Radius: 3

• Center: (-16, 14) Radius: 9

• Center: (-16, 14) Radius: 3

• Center: (-12, 6) Radius: 16

• Center: (-12, 6) Radius: 4

• Center: (12, -6) Radius: 8

• Center (12, -6) Radius: 4

• Center (12, -6) Radius: 16

• Center: (2,2) Radius: 9

• Center: (0,0) Radius: 9

• Center: (0,2) Radius: 3

• Center: (0,0) Radius: 3

Which of the following is the equation of this circle?

Which of the following is the equation of this circle?

• A) x² + y² = 81

• B) x² + (y + 2)² = 9

• C) (x + 2)² + (y + 1)² = 9

• D) x² + y² = 9

Write the standard equation of this circle.