Circumference or Area

The Swan family installs an aboveground pool. The circular pool covers about 78.5 square feet of lawn in the backyard. What is the length, in feet, of the edge of the pool? Use π≈3.14

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4

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?

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4

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

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4

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?

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4

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

• Area $A=\pi r^2$  

• Circumference $C=\pi d$  

Tags

CCSS.7.G.B.4

Fiona created the sculpture here using a square and a circle. How many square feet of material did the circular part of the sculpture require?

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4

A local construction company builds a train of wood to donate to a children’s park. One of the wheels has a radius of 2  $\frac{1}{2}$  feet. How many square feet of wood does the company need to construct 4 wheels for the train? Use π≈3.14

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4

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

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4

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

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4

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

• Area $A=\pi r^2$

• Circumference $C=\pi d$

Tags

CCSS.7.G.B.4