Parts of Circles, Circumference, Area, Volume of Cylinders

What is AF?

• Chord

• Radius

• Secant

• Tangent

What is DG?

• Secant

• Radius

• Chord

• Tangent

Find the circumference of a circle with a radius of 12.5 mm .

• 37.68mm
• 18.84mm
• 78.5mm
• none of the above

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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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

If my diameter is 19 inches, what is my radius?

• 38 inches
• 9.5 inches
• 59.66 inches
• 119.32 inches

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

• c = 15π
• C = 2π15
• c = 15 ÷ π
• c = 15 π