Circles Circumference

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

The radius is 8 inches.  What is the circumference?

• 50.24 inches
• 25.12 inches
• 12.56 inches
• 200.96 inches

What is the area of a circle?

• The distance around a circle.
• The space inside the circle.
• A line from side to side passing through the center.
• A line from the center to the side.

How do you find the radius?

• π*2
• d/2
• π*r
• I do not know

What is the diameter of this circle?

• 3.5
• 6.5
• 6
• 7

What is the radius of this circle?

• 18
• 36
• 9
• 6

Find the circumference of the circle

• 21.98
• 153.86
• 43.96
• 615.44

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

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