Circumference Area and Volume of Circles

What is the area of this circle?

• 82.13 m²

• 78.50 m²

• 314.16 m²

• 170.12 m²

MUST DO: Elsie bought a circular rug that is 9 feet in diameter. What is the circumference of the rug rounded to the nearest tenth of a foot?

• 4.5 feet

• 14.1 feet

• 28.3 feet

• 56.5 feet

Find the area of the circle

• 56.52

• 254.34

• 1017.36

• 113.04

Find the circumference (to the nearest whole number)

• 88 in

• 44 in

• 116 square in

• None of the above

Sort the problems into two groups based on whether you would use the circumference or the area of the circle to answer the question.

Groups:

(a) Circumference

,

(b) Area

• How far does a unicycle move when the wheel makes 5 full rotations?

• How fast do you go when riding a Ferris Wheel?

• How many times must a horse go around a horse walker to walk 1 mile?

• How much room is there to spread frosting on a cookie?

• How much fabric is needed for a round table cloth?

• How many feet are traveled by a person riding once around a merry-go-round?

• How much green space is there inside a traffic roundabout?

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

Hilary's Horse Hideaway is buying dirt to fill their circular training area. The training circle is 28 feet across. The dirt is sold in truckloads that cover 75 square feet of ground. How many truckloads of dirt will Hilary need?

• 8 truckloads

• 32 truckloads

• 33 truckloads

• 9 truckloads

The circumference of a circle is 28.26 cm. What is closest to the area of the circle.

• 254.34 cm²

• 14.13 cm²

• 63.6 cm²

The diameter of a circle is 3 centimeters. What is the circumference?

• 11.5cm2

• 9.42 cm2

• unicorns are awsome

• 45.3 cm2

The diameter of the face-off circle on an ice-hockey rink is 30 feet. Find its area.

• 675.6 ft²

• 29.67 ft²

• 545.8 ft²

• 706.5 ft²

Mrs. Apple just bought a new dinning room table. She needs to make a table cloth for decoration. What amount of fabric should she buy if the table has a diameter of 5 feet? Choose the equation that would best help solve this problem.

• C = π5

• C = (2)(π)(2.5)

• A = π x 5 x 5

• A = π x 2.5 x 2.5