Circle Equation Standard Form

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

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

• Centre  (4,3)
  Radius = 5 units

• Centre  (4,3)
  Radius = 25 units

• Centre  (-4,-3)
  Radius = 25 units

• Centre  (-4,-3)
  Radius = 5 units

What is the coordinates of the centre and the radius of the circle with equation:
(x + 3)^2 + (y + 1)^2 = 2^2 ?

• Centre  (-3,-1)
  Radius = 4 units

• Centre  (3,1)
  Radius = 2 units

• Centre  (-3,-1)
  Radius = 2 units

• Centre  (3,1)
  Radius = 4 units

What is the coordinates of the centre and the radius of the circle with equation:
(x - 5)² + (y + 3)² = 36?

• Centre (5,-3)
  Radius = 6 units

• Centre (-5,3)
  Radius = 6 units

• Centre (-5,3)
  Radius = 36 units

• Centre (5,-3)
  Radius = 36 units

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 equation of the circle shown in the graph?

Mathematical Equivalence

ON

What is the coordinates of the centre and the radius of the circle with equation:
(x + 7)^2 + (y - 6)^2 = 64 ?

• Centre (7,-6)
  Radius = 8 units

• Centre (-7,6)
  Radius = 64 units

• Centre (-7,6)
  Radius = 8 units

• Centre (7,-6)
  Radius = 64 units

What is the equation of the circle, with center (-6,-9) and radius 7 units?

• (x + 6)^2 + (y + 9)^2 = 49

• (x + 6)^2 + (y + 9)^2 = 7

• (x - 6)^2 + (y - 9)^2 = 49

• (x - 6)^2 + (y - 9)^2 = 7

What is the equation of the circle, with centre (7,-3) and radius 8 units?

• (x - 7)^2 + (y + 3)^2 = 8

• (x - 7)^2 + (y + 3)^2 = 64

• (x + 7)^2 + (y - 3)^2 = 8

• (x + 7)^2 + (y - 3)^2 = 64

What is the coordinates of the centre and the radius of the circle with equation:
(x - 1)^2 + (y - 2)^2 = 3^2 ?

• Centre (-1,-2)
  Radius = 3 units

• Centre (1,2)
  Radius = 3 units

• Centre (-1,-2)
  Radius = 9 units

• Centre (1,2)
  Radius = 9 units