Equation of a Circle

Equation of a Circle

Geometry

Multiple Choice

What is the center of the circle with equation

x² + y² = 1 ?

• (1, 1)

• (0, 0)

• (-1, -1)

Multiple Choice

What is the center of a circle with equation

(x-4)² + y² = 5 ?

• (-4, 0)

• (4, 0)

• (4, 1)

• (-4, 1)

Multiple Choice

What is the radius of a circle with equation

(x+7)² + (y-2)² = 144 ?

• 7

• 12

• 13

Multiple Choice

Write the equation of the circle with a center at (2, –4)

and a radius of 4.

• (x – 2)² + (y + 4)² = 4

• (x + 2)² + (y – 4)² = 4

• (x – 2)² + (y + 4)² = 16

• (x + 2)² + (y – 4)² = 16

Multiple Choice

Write the equation of a circle with a center at (7, 0)

and a radius of 3.

• (x - ^7)^2 + y^2 = 9

• x^2 + (y -7)^2 = 9

• (x - 7)^2 + y^2 = 3

• x^2 + (y -7)^2 = 3

Multiple Choice

What is the center of this circle?

• (2, 2)

• (2, -2)

• (0, 0)

• (-2, 2)

Multiple Choice

What is the radius of this circle?

• 2

• 6

• 3

• 5

Multiple Choice

What is the equation for this circle?

• (x+1) + (y+1) = 9

• x² + y² = 9

• x + y = 9

Multiple Choice

Write the equation of the graphed circle.

• x² + (y + 3)² = 3

• x² + (y – 3)² = 3

• x² + (y + 3)² = 9

• x² + (y – 3)² = 9

Poll

Are you understanding the math concepts from this lesson today?

Open Ended

As you met the success criteria for equations of circles, write down one important thing to remember about the lesson today.