Center and Radius in the Equation of a Circle

In the equation (x - 4)² + (x - 3)² = 25, the radius is...

• 4

• 3

• 5

• 25

In the equation (x-3)²+(y-2)²=16, the radius of the circle is...

• 16

• 32

• 3

• 4

What is the equation for this circle?

• (x+1)+(y+1)=9

• x²+y²=9

• x+y=9

In the equation (x-4)²+(x-3)²=25, the radius is

• 4

• 3

• 5

• 25

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

• 4

• 2

• 3

• 16

Write 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

In order to convert from general form to center-radius form, you must ___________. 

• Multiply out

• expand

• factor

• complete the square

Which of the following equations of circle in general form given the center at (3, 4) and radius of 5 units?

• (x – 3)² - (y – 4)² = 25

• (x – 3)² + (y – 4)² = 25

• x² + y² + 6x - 8y - 25 = 0

• x² + y² - 6x - 8y = 0

What is the equation of a circle whose diameter is 24 and whose center is at the origin?

• x²+y²=125

• x²+y²=64

• x²+y²=144

• x²+y²=576

(x - 3)² + (y - 2)² = 16, the center of the circle is...

• (3,2)

• (-3, -2)

• (-2, -3)

• (2, 3)