Circles: Areas and Circumference

A Circle has a radius of 4.  What is the circumference of the circle? (Best Choice)

• 4π or about 12.56

• 16π or about 50.24

• 2π or about 6.28

• 8π or about 25.12

The distance along an arc measured in linear units.

• area of a sector

• arc length

• arc of a circle

• sector of a circle

Find the circumference of a circle with a radius of 12.5 mm. Round to nearest hundredth. Don't forget to label.

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Round to nearest hundredth. Don't forget to label.

The circumference is 62.8 inches. What is the radius? Round to the nearest whole number. Don't forget to label.

A circular pie has an area of 706.5 cm². What is the radius of the pie? Round to nearest whole number. Don't forget to label.

Ms. Merine calculated that her hoop earring has a diameter of 3.5 centimeters. What is the area of her earring? Round to the nearest hundredth. Label as square centimeters or sq cm.

Hannah drew a circle with a radius of 30 cm. Jonas drew a circle with a radius of 20 cm. What is the approximate difference in the areas of their circles? Round to the nearest hundredth. Use a comma in your answer and label as (sq cm) or (square cm) or (square centimeter)

A circular swimming pool has a radius of 15 feet. The family that owns the swimming pool wants to put up a circular fence that is 5 feet away from the pool at all points. What is the circumference of the fence they will need? Hint: Draw what you know. Round to nearest hundredth. Don't forget to label.

The stained glass window is a semicircle. What is the distance around the window? Round to nearest hundredth. Don't forget to label.