Real World Area and Circumference

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

The circumference of a circle is 18.41 feet. What is the approximate length of the radius? Use 3.14 for π.

• 3 ft

• 5 ft

• 7 ft

• 8 ft

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

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.

Mr. Blain designed a circular walkway in front of his house. The diameter of the walkway is about 6 feet long. How many square feet of bricks will he need to buy? Use 3.14 for π.

• 18.84 square feet

• 113.04 square feet

• 9.42 square feet

• 28.26 square feet

Alisha made a 16-inch pizza. She ate a quarter of the pizza for lunch. Find the area of the remaining pizza. Use 3.14 as an approximation for π. Use "sq. in." as your units.

As part of her artwork, Amir bends a length of wire into the figure shown. The figure is made up of a semicircle and a quadrant.

Find the length of the wire. Use 3.14 as an approximation for π.

What is the radius of this circle?

• 18

• 36

• 9

• 6