Conic Section - The Circle

What is the equation of the circle?

• (x + h)² + (y + k)² = r²

• (x + h)² + (y + k)² = r

• (x - h)² + (y - k)² = r²

• (x - h)² + (y - k)² = r

What is the radius of the equation (x + 5)² + (y - 10)² = 9?

• 4.5

• 9

• 3

• 81

What is the center of this equation

(x - 3)² + (y + 2)² = 16

• (-3, 2)

• (3, 2)

• (-3, -2)

• (3, -2)

Give the center of this equation

(x - 1)² + (y + 2)² = 9

Which of the following is the graph of this equation (x - 7)² + (y + 1)² = 1?

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Find the graph of this equation

(x - 3)² + y² = 4

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Which of the following center and radius gives the equation (x - 3)² + (x + 4)² = ⁹/₄?

• Center: (3, -4)

  Radius: ³/₂

• Center: (-3, -4)

  Radius: ³/₂

• Center: (-3, -4)

  Radius: ⁹/₂

• Center: (3, -4)

  Radius: ⁹/₂

What is the radius in this equation

(x - 0)² + (y - 1)² = 4?

Give the center in this equation

(x - 2)² + (y + 4)² = 25

What is the radius in this equation?

x² + y² = 121