Equations of Circles

What is the center of the circle whose equation is 𝒙𝟐+ 𝒚𝟐+𝟏𝟎𝐱−𝟏𝟒𝐲+𝟕𝟎=𝟎 ?

• (5,7)

• (-5,7)

• (5,-7)

• (-5,-7)

What is the radius of the circle whose equation is 𝒙𝟐+ 𝒚𝟐+𝟏𝟎𝐱−𝟏𝟒𝐲+𝟕𝟎=𝟎 ?

• 2

• 3

• 4

• 5

What is the center of the circle whose equation is 𝒙𝟐+ 𝒚𝟐−𝟔𝐱+𝟏𝟔𝐲+𝟒𝟎=𝟎 ?

• (3,8)

• (-3,-8)

• (3,-8)

• (-3,8)

What is the radius of the circle whose equation is 𝒙𝟐+ 𝒚𝟐−𝟏𝟎𝐱+𝟏𝟔𝐲+𝟒𝟎=𝟎 ?

• 5

• 6

• 7

• 8

What is the general form of the equation of circle?

• 𝒙𝟐+ 𝒚𝟐+ 𝑫𝒙+  𝑬𝒚+  𝑭=𝟎

• 𝒙𝟐+𝒚𝟐=𝒄𝟐

• (𝒙−𝒉)𝟐+(𝒚−𝒌)𝟐=𝒓𝟐