Coordinate Geometry - The Circle 1

The equation of a circle is: x²+y²-12x+6y-55=0.

Its radius is ... units long.

The diameter of a circle is AB. A(5;-4) and B(-3;2). The first coordinate of the centre of this circle is ....

• (-7,8)

• (7,-8)

• (7,8)

• (-7,-8)

Write the equation of the circle 

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 this circle?

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

Based on the graph, what is the standard equation of the circle?

• $(x-4)^2+(y+2)^2=4$

• $(x+4)^2+(y-2)^2=4$

• $(x-2)^2+(y+4)^2=4$

• $(x+2)^2+(y-4)^2=4$

• A
• B
• C
• D