Finding the equation of the Circle

What is the equation of the circle whose center and radius are (0, 0) and 7 cm. respectively?

• x² + y² = 7

• x² + y² = 14

• x² + y² = 49

• x² + y² - 7 = 0

Find the equation of the circle whose center is (0, 3) and radius is 4cm. ?

• (x - 3)² + y² = 4

• x² + (y - 3)² = 16

• x² + y² = 16

• x² + (y + 3)² = 16

The standard form for the equation of a circle is x² + y² = r²

• TRUE

• FALSE

What is the center of the radius whose equation is x² + y² = 25

• 5

• 10

• 25

• (0, 0)

What is the equation of the circle whose center and radius are (-3, -2) and 10 respectively?

• (x – 3)² + (y – 2)² = 10

• (x – 3)² + (y – 2)² = 100

• (x + 3)² + (y + 2)² = 10

• (x + 3)² + (y + 2)² = 100

Find the equation of the circle whose center and radius are (0, 0) and 8.

• x² + y² = 4

• x² + y² = 8

• x² + y² = 16

• x² + y² = 64

The center of the circle with the equation (x - h)² + (y + k)² = 4 is (h, k).

• TRUE

• FALSE

What is the radius of the circle in the given figure?

• -3

• -6

• 3

• 6

What is the center of the circle in the given figure?

• (3, 0)

• (0, 3)

• (0, -3)

• (-3, 0)

What is the radius of the circle whose equation is (x – 4)² + (y – 3)² = 4a²

• 4a²

• 2a²

• 2a

• a²