Equation of a Circle Practice

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

• 4

• 2

• 3

• 16

Write the equation of a circle with center (4, -2) with radius 2.

• (x - 4^)^2 + (y+2)^2 = 4

• x^2 + (y +2)^2 = 4

• (x - 4)^2 + (y+2)^2 = 2

• (x+2)^2 + (y -4)^2 = 4

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

• 4

• 2

• 3

• 16

Write the equation of a circle with center (7, 0) with radius 3. 

• (x - 7)² + y² = 9

• x² + (y -7)² = 9

• (x - 7)² + y² = 3

• x² + (y -7)² = 3

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

• (1, 1)

• (0, 0)

• not enough information

What are the coordinates of the center and the radius of the circle with equation:
(x - 4)² + (y - 3)² = 25 ?

• Center (4,3)
  Radius = 5 units

• Center (4,3)
  Radius = 25 units

• Center (-4,-3)
  Radius = 25 units

• Center (-4,-3)
  Radius = 5 units

In the equation (x-3)²+(y+4)²=121, the radius of the circle is

• 242

• 11

• 121

• 22

What is the equation of a circle whose diameter is 24 and whose center is at the origin?

• x²+y²=125

• x²+y²=64

• x²+y²=144

• x²+y²=576

What is the center and the radius?

• C(1,5)

  r=64

• C(5,1)

  r=8

• C(-5,-1)

  r=64

• C(-1,-5)

  r=8

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

• x²+y²=4

• x²+y²=81

• x²+y²=9