Areas and Circumference of Circles and Semicircles

What is the area of a circle with the diameter of 10 cm ? Round to the nearest hundredth. Don't forget to label square cm or sq cm.

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.

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 track with a diameter of 60 meters is shown. Shaleah walked around the track 4 times. Approximately how many meters did she walk? Round to the nearest hundredth. Don't forget to label.

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

A _____ is half of a circle.

• circumference

• pi

• semicircle

• composite figure

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.