Ellipses and Circles

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

• 3

• 5

• 10

• 25

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

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 equation for the focus points on an ELLIPSE?

• c² = a² + b²

• c² = a² - b²

• 1/4d

• (x-h)² + (y-k)² = r²

Graph the ellipse:

• 
• 
• 
• 

• (4, 7)

• (–4, –7)

• (–4, 7)

• (4, –7)

Write the equation of the circle centered at (5, –3) and has a radius of length 7.

• (5, 7) and (-5, 7)

• (0, 12) and (0, 2)

• (0, -2) and (0, -12)

Write the standard form equation of an ellipse that has: center (-5, 6) vertex (-5, -4) co-vertex (-13, 6)

Write the standard form equation of an ellipse that has: vertices (-10, 9), (-10, -7) co-vertices (-7, 1), (-13, 1)