Circle Equation Standard

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

• (1, 1)

• (0, 0)

• 1

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

Write the standard equation of the circle with the given center and radius; center (0, 0) and radius of 3.

• x² + y² = 4

• x² + y² = 81

• x² + y² = 9

• x² + y² = 3

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

• 0

• 0.5

• 1

• 2

Which of the following is the standard equation of the circle given the conditions: center at the origin with radius 4

• x² + y² = 4

• x² + y² = 8

• x² + y² = 16

• x² + y² = 64

Which of the following is the standard equation of the circle given the conditions: center at (-4, 3) and radius at √7

• (x + 4)² + (y - 3)² = √7

• (x + 4)² + (y - 3)² = 7

• (x - 4)² + (y + 3)² = √7

• (x - 4)² + (y + 3)² = 7

What is the equation for this circle?

• (x+1)²+(y+1)²=9

• x²+y²=9

• x²+y²=6

• x²+y²=3

What does (h,k) stand for in the standard circle equation?

• (h,k) is the center of the circle

• (h,k) is a point on the circle.

• (h,k) is the radius of the circle

• (h,k) is the diameter of the circle

Which graph corresponds to 
(x)²+ (y-6)²=9

• A

• B

• C

• D

Which graph corresponds to (x+2)²+ (y-3)²=36

• A

• B

• C

• D