Circles Standard Form

What is the equation of a circle with radius 2 and center (3, 4)?

• (x + 3)² + (y + 4)² = 2

• (x - 3)² + (y - 4)² = 2

• (x + 3)² + (y + 4)² = 4

• (x - 3)² + (y - 4)² = 4

What is the equation of a circle with radius 4 and center (0, 8)?

• x² + (y - 8)² = 16

• (x - 8)² + y² = 4

• x² + (y - 8)² = 4

• x² + (y + 8)² = 16

What is the center of the circle with equation x² + y² = 1?

• (1, 1)
• (0, 0)
• not enough information

See Picture

• A
• B
• C
• D

Which graph corresponds to

x² + (y - 6)² = 9

• A

• B

• C

• D

• A
• B
• C
• D

In the equation (x - 3)² + (y - 2)² = 16, the center of the circle is...

• (3, 2)

• (-3, -2)

• (-2, -3)

• (2, 3)

In the equation (x + 2)² + (y - 3)² = 4, the radius of the circle is...

• 4

• 2

• 3

• 16

In the equation (x - 4)² + (y - 3)² = 25, the radius is

• 4

• 3

• 5

• 25

• 625

In the equation (x - 3)² + (y - 2)² = 16, the radius of the circle is...

• 16

• 32

• 3

• 4

• 256