Area and Circumference of Circles

The ratio of circumference to diameter is 

• irrational
• half
• rational
• pi

If the diameter of a circle is 50 yards, the radius is _____

• 100 yards
• 25 yards
• 150 yards
• 15 yards

If the radius of a circle is 12.5 meters, the diameter is ____

• 6.25 meters
• 125 meters
• 25 meters
• 50 meters

Meg swam from one side of her circular pool to the other side going through the center.  If Meg swam 8 feet, what is the approximate circumference of Meg's pool?

• 16 feet
• 25.12 feet
• 251.2 feet
• 4 feet

Tom measured his frisbee from the center to the outside and found it to be 6 inches.  What is the approximate circumference of Tom's frisbee?

• 37.68 inches
• 3 inches
• 12 inches
• 376.8 inches

Serena drew a circle with a circumference of 157 centimeters.  What is the approximate diameter of the circle she drew?

• 1.57 cm
• 15.7 cm
• 50 cm
• 25 cm

Shring's dining room table is round and has a radius of 4.5 feet. What is the tabletop's approximate circumference?

• 14.13 ft
• 20.68 ft
• 26.28 ft
• 28.26 ft

The Jones family wants to enclose their circular garden with a fence. To the nearest foot, what is the minimum length of fencing they need to buy?

• 56.25 ft
• 246 ft
• 365 ft
• 393 ft

find the area of the circle below.

• 100 cm
• 225 cm
• 9 cm
• 28.26 cm

A remodeling project calls for sanding a chair with a disk sander. The sanding disk used on the sander has a radius of 4.5 inches. Find the area of the disk. Use 3.14 for π

•  about 64.79 in2
•  about 55.19 in2
•  about 63.59 in2
•  about 53.79 in2