Circles: Circumference and Area Review

Select all of the formulas below that can be used to find the circumference of a circle.

• πd

• πr²

• πdr

• 2rπd

• 2πr

Tags

CCSS.7.G.B.4

The radius of a circle is 4 meters. What is the circumference of the circle? Use 3.14 for π.

• 12.56 meters

• 50.24 meters

• 25.12 meters

• 100.48 meters

Tags

CCSS.7.G.B.4

The diameter of a circle is 12 meters. What is the circumference of the circle? Use 3.14 for π.

• 18.84 meters

• 37.68 meters

• 75.36 meters

Tags

CCSS.7.G.B.4

Select the formula for finding the area of a circle.

• 2πr

• π²r

• d²π

• πr²

Tags

CCSS.7.G.B.4

A circle has a diameter of 9 feet. What is the area of the circle? Use 3.14 for π. Round your answer to the nearest hundredth.

• 254.34 square feet

• 88.74 square feet

• 63.59 square feet

• 78.52 square feet

Tags

CCSS.7.G.B.4

The image shows two circles. The diameter of Circle A measures 5 cm, and it is the same as the radius of Circle B. What is the diameter of Circle B?

• 5 cm

• 25 cm

• 10 cm

• 12.5 cm

Tags

CCSS.7.G.B.4

The image shows two circles. The diameter of Circle A measures 5 cm, and it is the same as the radius of Circle B. What is the circumference of Circle B? Use 3.14 for π.

• 15.7 cm

• 31.4 cm

• 78.5 cm

• 157 cm

Tags

CCSS.7.G.B.4

The image shows two circles. The diameter of Circle A measures 5 cm, and it is the same as the radius of Circle B. What is the area of Circle B? Use 3.14 for π.

• 15.7 cm

• 31.4 cm

• 78.5 cm

• 157 cm

Tags

CCSS.7.G.B.4

In the image, what is the area of the outer ring of the circle? Use 3.14 for π. Round your answer to the nearest hundredth if necessary.

• 76.54 mm²

• 153.08 mm²

• 149.25 mm²

• 151.98 mm²

Tags

CCSS.7.G.B.4

In the image, how much longer is the circumference of the outer edge of the circle than the circumference of the inner edge of the circle? Use 3.14 for π. Round your answer to the nearest tenth if necessary.

• 15.7 mm

• 19.5 mm

• 7.85 mm

• 13.7 mm

Tags

CCSS.7.G.B.4