circles review

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?

• 18
• 72
• 38
• 14

What is the diameter of a circle with radius 1 ft?

• 1ft
• 2ft
• 3ft
• 0.5

What is the diameter?

• 5 in
• 10 in
• 3.14 in
• 15.84 in

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
• none of the above

What is the area of this circle?

• 163.2
• 15.3
• 124.2
• 113.1

What is the radius of this circle?

• 20
• 10
• 40