Standard Form of Circles

What is the equation of the circle with the given information?

• A

• B

• C

• D

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

The endpoints of the diameter of a circle are (-10, -11) and (8, -9). Write the standard form equation of the circle.

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

• (3,2)

• (-3, -2)

• (-2, -3)

• (2, 3)

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

• A

• B

• C

• D

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

Which graph corresponds to (x-4)²+ (y+4)²=25

• A

• B

• C

• D

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

• A

• B

• C

• D

What is the equation for the circle?

• A

• B

• C

• D

What is the coordinates of the centre and the radius of the circle with equation:
(x - a)² + (y - b)² = r² ?

• Centre (a,b)
  Radius = r^2 units

• Centre (-a,-b)
  Radius = r units

• Centre (a,b)
  Radius = r units

• Centre (-a,-b)
  Radius = r^2 units