Circles and Circumference and Pi

What is the distance around a circle?

• Circumference
• Area
• Diameter
• Radius

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

• Radius
• Diameter

A circular swimming pool is 21 feet in diameter.
How many feet around is the pool?

• 10.5 ft
• 42 ft
• 65.94 ft
• 131.95 ft

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

• Radius
• Diameter

What is the radius of a circle with diameter 24 cm?

• 24cm
• 48cm
• 12cm
• 12cm²

What is the diameter?

• 8 cm
• 16 cm
• 10 cm
• 4 cm

What is the radius?

• 18 ft
• 72 ft
• 38 ft
• 18

What is the circumference of this circle ?

• 3.14 cm 
• 37.68 cm
• 24 cm
• 68.4 cm

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

• 37.68mm
• 18.84mm
• 78.5mm
• 39.25mm

Find the circumference (to the nearest whole number)

• 88 in
• 44 in
• 116 in
• 87 in