Area and Circumference of Circles

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

Tags

CCSS.7.G.B.4

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

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.7.G.B.4

Tags

CCSS.7.G.B.4

What is the formula to calculate the circumference of a circle?

Tags

CCSS.7.G.B.4

A circular garden has a radius of 14 meters. What is the length of the fence required to enclose it?

Tags

CCSS.7.G.B.4

Match the following definitions to the terms:

• Circumference of a circle

• How much space a circle takes up

• Units of circumference

• feet, cm, inches

• The distance around a circle

• Units of area

• square units (units²)

• Area of a circle

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a diameter of 8 inches?

Tags

CCSS.7.G.B.4

Tags

CCSS.7.G.B.4

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

Tags

CCSS.7.G.B.4