Circumference and Area of Circles

The circumference of the wheel on Roy's bicycle is 225 in. What would you do to determine the radius of the wheel?

• Divide the circumference by 𝜋.

• Divide the circumference by 𝜋 to find the diameter; then divide the diameter by 2 to find the radius.

• Multiply the circumference by 𝜋.

• Multiply the circumference by 𝜋 to find the diameter; then divide the diameter by 2 to find the radius.

Tags

CCSS.7.G.B.4

The formula for finding the area of a circle is...

Tags

CCSS.7.G.B.4

The cost of painting the circular traffic sign is $3.50 per square foot. How much to the nearest dollar, will it cost to paint the sign if it diameter measures 36 inches?

• $20

• $25

• $30

• $35

Tags

CCSS.7.G.B.4

Mrs. Wilson placed the welcome mat shown below on her front door step. What is the area of her welcome mat in square feet? Round to the nearest tenth.

• A = 36.4 in sq

• A = 50.2 in sq

• A = 31.4 in sq

• A = 25.1 in sq

Tags

CCSS.7.G.B.4

A ceiling fan is pictured above. The tip of one of the fan blades is labeled point A.  Point A is 28 inches away from the center of the fan. About how far does point A on the fan travel when the fan blades make one full revolution?

• 28 inches

• 56 inches

• 176 inches

• 88 inches

Tags

CCSS.7.G.B.4

Find the area of the figure shown.

• 1017.36 cm

• 254.34 cm

• 26.52 cm

• 123.65 cm

Tags

CCSS.HSG.C.B.5

Sadie has 38 inches of fringe to sew around a circular pillow. What is the approximate diameter of the largest pillow she can use?

• 6 inches

• 9 inches

• 10 inches

• 12 inches

Tags

CCSS.7.G.B.4

what is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

Tags

CCSS.7.G.B.4

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area?

• 31.25 m²

• 29.55 m²

• 30.36 m²

• 28.26 m²

Tags

CCSS.7.G.B.4

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Use π = 3.14.

• 4 in.

• 8 in.

• 12 in.

• 16 in.

Tags

CCSS.7.G.B.4