Circle Quiz

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

In the equation
(x+2)²+(y+3)²=49, what is the center of the circle?

• (2, 3)
• (3, 2)
• (-3, -2)
• (-2, -3)

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 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

Identify the CENTER and RADIUS for the following circle:

 $\left(x\ +\ 2\right)^2\ +\ \left(y-4\right)^2=\ 81$  

• Center: (0,0) Radius: 9

• Center: (-2, 4) Radius: 9

• Center: (1,1) Radius: 18

• Center: (-2, 2) Radius: 18

Identify the CENTER and RADIUS for the following circle:

 $\left(x\ +\ 10\right)^2\ +\ \left(y+10\right)^2=\ 100$  

• Center: (0,0) Radius: 10

• Center: (0, 0) Radius: 1

• Center: (-10,-10) Radius: 10

• Center: (1, 1) Radius: 1

Identify the CENTER and RADIUS for the following circle:

 $\left(x\ -2\right)^2\ +\ \left(y-5\right)^2=\ 9$  

• Center: (-5,-2) Radius: 9

• Center: (5, 2) Radius: 81

• Center: (-2, -5) Radius: 2

• Center: (2, 5) Radius: 3

What is the equation of the circle?

• (x+1)² + (y +1)² = 3
• (x+1)² + (y -1)² = 3
• (x+1)² + (y +1)² = 9
• (x-1)² + (y -1)² = 9

What is the radius of the circle given by the equation (x - 7)² + (y + 3)² = 25?

• 3

• 5

• 10

• 25

The diameter of a circle has length 12. The center is at (-5, 2). Give the equation of the circle.

• (x - 2)² + (y + 5)² = 36
• (x - 5)² + (y + 2)² = 6
• (x + 5)² + (y - 2)² = 36
• (x + 2)² + (y - 5)² = 6