Unit 3 - Area and Circumference of Circles

The city of Paris, France is completely contained within an almost circular road that goes around the edge. The radius is 3 miles. Use the map with its scale to estimate the circumference and area of Paris.

• Circumference = 18.84 mi; Area = 28.26 mi²

• Circumference = 9.42 mi; Area = 28.26 mi²

• Circumference = 18.84 mi; Area = 18.84 mi²

• Circumference = 28.26 mi; Area = 18.84 mi²

Here is a picture of a Ferris wheel. Which pictures show the diameter of the Ferris wheel.

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Here is a picture of a Ferris wheel. Which picture shows the radius of the Ferris wheel.

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Here is a picture of a Ferris wheel. It has a radius of 15 meters. How far does a rider travel in one complete rotation around the Ferris wheel?

• There is not enough information to answer the question.

• 47.1 meters

• 706.5 meters²

• 94.2 meters

An architect is making a plan for a new circular playground. If the picture is the playground, how much fencing needs to go up to keep the kids in the circle?

• 64 meters

• 200.96 meters

• 3215.36 meters²

• 12861.44 meters²

A dog is tied to a wooden stake in a backyard, like the one pictured. His leash is 5 meters long and he runs around in circles pulling the leash as far as it can go. How much area does the dog have to run around in?

• 31.4 meters

• 78.5 meters ²

• 85.7 meters²

• 1962.5 meter²

The radius of a birthday cake is 8 inches. How much icing will decorate the top of the cake. What procedure can be used to find the approximate amount of icing on the top of the cake? About how much icing will be needed?

• Circumference; 50.24 inches

• Circumference; 200.96 inches²

• Area; 50.24 inches

• Area; 200.96 inches²

The circumference of a circle is 36.31 meters. What is the approximate length of the radius?

• 11.56 meters

• 23.13 meters

• 5.78 meters

• 20 meters

It takes Kevin 5 minutes to jog once around a circular track that has a diameter of 400 meters. About how many meters did Kevin jog?

• 1256 meters/5 minutes

• 502,400 meters/5 minutes

• 251,200 meters/5 minutes

• 251 meters/5 minutes

Cassie is going to paint a circular design on the gymnasium floor.

She measures the diameter of her circle to be 24 feet.

How many gallons of paint should she buy if a gallon of paint covers 400 square feet.

• 1 gallon

• 2 gallons because 1 wouldn't be enough.

• 3 gallons because 2 wouldn't be enough.

• 4 gallons because 3 wouldn't be enough.