Review 6.7ab Circumference & Area

• 3.14

• 1.14

Ashley is building a circular fence around her garden.

  The diameter of the circular area enclosed by the fence is 15 feet.

The length of the fence that encloses the circular garden will be 47.1 feet.

What expression can be written to derive the approximation of pi?

Carlos is buying new tires for his car.

-          The diameter of the circular area of the tire is 18.2 inches.

-          The circumference around the tire is 57.14 inches. 

What expression can be written to derive the approximation of pi?

Ashley, Carlos, John and Sarah all constructed circles and measured the diameter or radius and the circumference of their circles.

Whose measurements can be used to derive the most accurate value of pi?

• Carlos

• Ashley

• Sarah

• John

Which is closest to area of the rug?

• 9.42 feet

• 4.71 feet

• 8.08 feet

• 7 feet

The radius of a circular swimming pool is 4.6 meters.  Which is closest to the circumference of this swimming pool?

• 66.44

• 57.77

• 14.44

• 28.88

A circular plate has a diameter of 12 inches. What is the area of the plate?