Radius and Diameter Word Problems

A bicycle trail in the shape of a circle has a diameter of 3 miles. Kiersty biked around the trail 4 times. About how far did Kiersty bike? Use 3.14 for π.

• 38 miles

• 40 miles

• 35 miles

• 33 miles

Mrs VanSciver bought a circular rug. The radius of the rug was 2.5 feet. How does the diameter of the rug compare to the radius? Use 3.14 for π.

• The diameter of the rug is twice the radius.

• The radius is twice the circumference.

• The diameter of the rug is half the radius.

• The diameter is twice the circumference.

An architect is making a plan for a new circular playground. If the picture below is the playground, how much fencing needs to go up to keep the kids in the circle? Use 3.14 for π.

• 3,215 m

• 201 m

• 402 m

• 100 m

The first Ferris wheel was built in 1893 in Chicago. Its diameter was 250 feet. How many feel did the Ferris wheel rotate with one complete turn? (Think the outside measurement of the circle.) Use 3.14 for π.

• 785 ft

• 390 ft

• 912 ft

• 543 ft

• 15

• 29

• 46

• 93

• 2 meters

• 1 meter

• 0.5 meters

• 4 meters

How many cookies are there?

• 48 cookies

• 24 cookies

• 8 cookies

• 4 cookies

• 5 meters

• 10 meters

• 15 meters

• 20 meters

The circumference of a circle is 36.31 meters. What is the approximate length of the radius? Use 3.14 for π.

• 3 m

• 4 m

• 5 m

• 6 m

The radius of a birthday cake is 4 inches. Icing will decorate the circumference of the cake. What procedure can be used to find the approximate circumference of the cake? Use 3.14 for π.

• Multiply 4 by 3.14.

• Multiply 4 by 2, and then multiply the product by 3.14.

• Multiply 4 by 4, and then multiply the product by 3.14.

• Divide 4 by 2, and then multiply the quotient by 3.14.