Understanding Circumference of a Circle

What is the circumference of a circle with a diameter of 6?

• 6π

• 12π

• 9π

• 3π

If a circle has a diameter of 3, what is its circumference?

• 3π

• 6π

• 9π

• 12π

How do you calculate the circumference of a circle when given the radius?

• Multiply the radius by 3π

• Multiply the radius by 4π

• Multiply the radius by 2π

• Multiply the radius by π

What is the circumference of a circle with a radius of 5?

• 20π

• 15π

• 10π

• 5π

For a circle with a radius of 9, what is the circumference?

• 9π

• 27π

• 18π

• 36π