Circles Part 1

In the equation (x − 3)² + (y − 2)² = 16, what are the center and radius of the circle?

• (3, 2)

  radius: 4 units

• (-3, -2)

  radius: 4 units

• (3, 2)

  radius: 16 units

• (-3, -2)

  radius: 16 units

A circle has the equation x² + y² − 12x + 8y + 3 = 0. Use completing the square to write the equation in standard form.

• (x − 6)² + (y + 4)² = 49

• (x + 4)² + (y − 6)² = 49

• (x − 6)² + (y + 4)² = 55

• x² + y² = 55

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area?

• 31.25 m²

• 29.55 m²

• 30.36 m²

• 28.26 m²

Which graph corresponds to (x)²+ (y − 6)² = 9

• A

• B

• C

• D

What is 7π/4 radians in degrees?

• 300

• 135

• 315

• 45

What is 225  degrees in radians? 

• 7π/4

• 5π/4

• 3π/4

• 5π/3

All circles are ______

• similar

• radiant

• perpendicular

• congruent

Danielle wants to make a cookies for 3 friends. The radius of a cookie is 5 inches. If she wants to ice ALL 3 of the cookies, how many square inches of cookies must she cover with icing?

• 47.1 in²

• 235.5 in²

• 78.5 in²

• 15.7 in² 

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

Which of the following names a diameter?

• segment AC

• segment DB

• segment AD

• segment ADC