Circumference

The diameter of a circle is 3 centimeters. What is the circumference?

• 11.5cm2
• 9.42 cm2
• unicorns are awsome
• 45.3 cm2

What is the diameter?

• 8
• 16
• 10
• 4

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

• 20ft
• 5ft
• 31.4ft
• 62.8ft

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

• 38 inches

• 5 inches

• 10 inches

• 50 inches

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

Determine the radius of the penny

• 59.66 mm
• 9.5 mm
• 38 mm
• 119.32 mm

Find the circumference (to the nearest whole number)

• 88 in
• 44 in
• 116 square in
• None of the above

What two formulas can you use to find the circumference?

choose TWO

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

What does C represent in the formula:

C = π·d

• Pi

• Circumference

• Diameter

• Area