Choosing Circumference or Area

How many square inches of cheese fit on a slice of pizza

• Area

• Circumference

How many times must a horse go

around a horse walker to walk 1 mile?

• Area

• Circumference

How much room is there

to spread frosting on a cookie?

• Area

• Circumference

Marcel bought a new pair of inline skates. Each wheel on the skates is 41 millimeters in radius. Which shows the number of millimeters traveled in 5 full rotations of a wheel?

Mr. Rives’ rotating sprinkler waters his lawn up to a radius of 7 feet. What is the maximum number of square feet of lawn Mr. Rives can expect two sprinklers to cover?

Use π≈3.14

Mr. Dean paints the top of a round picnic table. The diameter of the table is 6 feet. The paint he uses comes in a can that covers 18 square feet of surface. How many cans of paint does Mr. Dean need to purchase to paint one coat on the top of the table?

Coach Tipton marks the soccer field each week with striping paint using a roller wheel such as the one shown here. If the distance the wheel travels in one full rotation is 45 feet, what is the radius of the roller wheel? Use π≈3

The swinging door at the local ice cream parlor has a circular window. What is the approximate distance around the window, in feet? Use π≈3.14

Randy shops for circular stepping stones for his yard. He finds a stone with a circumference of 36 inches. What is the diameter of the stone, in inches? Use π≈3.14

For the school fair, Helen paints a large bullseye for the beanbag toss. The radius of the innermost circle is 6 inches. The diameter of the middle circle is 2 feet. The diameter of the largest circle is 6 feet. Helen paints the shaded region of the bullseye. How many square feet does Helen paint? Use π≈3.14