Circle Review AIS

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

• 20ft
• 5ft
• 31.4ft
• 62.8ft

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

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

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

What is the diameter?

• 8
• 16
• 10
• 4

What is the radius of a circle?

• the perimeter of a circle
• the space inside the circle
• the line that goes through the middle of a circle
• half of the line that goes through the middle of a circle

What is the diameter of a circle?

• the distance around the outside of a circle
• the line that goes across the circle through the center
• half of the line that goes through the center of the circle
• the space inside the circle

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

A bicycle tire has a diameter of 27 inches. What is the radius?

• 27π
• 13.5
• 81
• 25π

Is this radius or diameter?

• Radius

• Diameter