Angles and 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?