Understanding Circumference of a Circle

What is the diameter of a circle?

• The distance around the circle

• The area of the circle

• A line segment that passes through the center and touches two points on the circle

• A line segment from the center to any point on the circle

How is the circumference of a circle related to its diameter?

• Circumference is twice the diameter

• Circumference is Pi times the diameter

• Circumference is equal to the diameter

• Circumference is half the diameter

If the radius of a circle is 3, what is the diameter?

• 3

• 6

• 12

• 9

Which formula can be used to find the circumference if the radius is known?

• C = Pi * R

• C = R * D

• C = Pi * D

• C = 2 * Pi * R

In the example given, if the diameter is 4, what is the circumference?

• 16 * Pi

• 8 * Pi

• 2 * Pi

• 4 * Pi