Circumference of a Circler

The distance across a circle through its center is called the _____.

• diameter
• radius
• π
• center

The _____ is the distance from the center to any point on the circle.

• diameter
• radius
• π
• center

What is the formula for circumference of a circle given the diameter?

• C = π r
• C = 2 (3.14) r

• C = π d
• C = 2 π d

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2
• Divide the diameter by 2
• Add 2 to the diameter
• Subtract 2 from the diameter

What is the symbol for pi?

• #

• π

• &

• %

A pond has a diameter of 12 feet. What is its radius?

• 12 feet

• 6 feet

• 24 feet

• 144 feet

A tire has a radius of 14 inches. What is its diameter?

• 14 inches

• 7 inches

• 28 inches

• 21 inches

what is the circumference of this circle ?

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

A circle has a diameter of 17 inches. What is the circumference?

• 106.76 inches

• 53.38 inches

• 907.46 inches

• 34 inches

What is the circumference?

• 50.24
• 96
• 24
• 18