Center and Radius in the Equation of a Circle

What is the radius of the circle with this equation of  (x-5)²+(y+7)²=8?

• 4

• 8

• 4√2

• 2√2

What is the radius of the circle
(x+7)²+(y-2)²=144?

• 7

• 12

• 13

Determine the center and radius: x² + y² + 14x - 2y = -1

• center= (-7,2) radius= 3

• center= (-7,1) radius= 7

• center= (-4,1) radius= 5

In the equation (x-4)²+(x-3)²=25, the center of the circle is at...

• (-3, -4)

• (4, 3)

• (-4, -3)

• (3, 4)

In the equation (x+2)²+(y-3)²=4, the radius of the circle is...

• 4

• 2

• 3

• 16

What is the radius of the given circle:
 x²+y²-10x+8y-23=0?

• 4

• 2

• 8

In the equation (x + 2)² + (y - 3)² = 4, the radius of the circle is...

• 4

• 2

• 3

• 16

In the equation (x-3)²+(y+4)²=121, the center of the circle is at...

• (3, -4)

• (-3, 4)

• (4, 3)

• (-4, -3)

How can we find the general form of a circle? 

• divide out the center-radius form

• multiply out the center-radius form

• factor out the center-radius form

• add up the center-radius form

What is the equation for this circle?

• (x+1)+(y+1)=9

• x²+y²=9

• x+y=9