Circumference and Area

Calculate the circumference of a circle with a radius of 17 inches. Round to the nearest hundredth.

Tags

CCSS.7.G.B.4

Johanna is selling cheese at the farmers' market. One wheel of cheese has a diameter of 9 inches. Calculate the area of the wheel of cheese to the nearest one hundredth ______ square inches.

Tags

CCSS.7.G.B.4

Using the information in the last question, calculate the cost per square inch if the wheel costs $18.60. The cost is $______ per square inch.

Yoko made a circular coaster in pottery class. When he used the ruler to measure the radius, he got 4 cm. Which of the following is closest to the area of the top of the coaster?

• 64 cm²

• 24 cm²

• 46 cm²

• 51 cm²

Tags

CCSS.7.G.B.4

Abran has 42 linear feet of fencing to build a pen for four puppies. Which of the following statements best describes the pen he should build in order to provide the maximum area for these puppies?

• A circular pen with a radius of approximately 6.5 ft

• A rectangular pen with dimensions of 10 ft by 11 ft

• A square pen with side lengths of 10.5 ft

• An equilateral triangular pen with side lengths of 14 ft

Answer explanation

42 feet refers to the distance around the pen. You really don't need to do any math here. Just read the answers and you will see that only one answer is a circle.

Tags

CCSS.4.MD.A.3

Using a ruler to measure a quarter, Allan measured his quarter to be about 2 cm across. Which of these is the closest to the circumference of the coin?

• 7.5 cm

• 4.5 cm

• 9.4 cm

• 3.1 cm

Tags

CCSS.HSG.GMD.A.1

The diagram below models the length from the center of a wind turbine to the tip of one of its blades. Which of these is closest to the total area covered by the blade when the turbine makes 1 revolution?

• 3,215 m²

• 100 m²

• 1,024 m²

• 201 m²

Tags

CCSS.7.G.B.4

Jennifer painted a tabletop that is shaped like a circle. The circumference of the tabletop is 6π feet. Which measurement is closest to the area of the tabletop in square feet?

• 18.84 ft²

• 28.26 ft²

• 37.68 ft²

• 113.04 ft²

Tags

CCSS.7.G.B.4

What does the red line represent?

• Radius

• Diameter

• Circumference

• Area

What does the green line represent?

• Radius

• Diameter

• Circumference

• Area