Calculating the Circumference of a Circle Given the Radius | Math with Mr. J

What does the circumference of a circle represent?

• The area inside the circle.

• The distance across the circle through its center.

• The distance around the circle.

• The distance from the center to any point on the circle.

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

• The diameter is half the radius.

• The diameter is twice the radius.

• The diameter is equal to the radius.

• The diameter is three times the radius.

A circle has a radius of 9 cm. What is its circumference in terms of π?

• 9π cm

• 18π cm

• 81π cm

• 3π cm

If a circle has a radius of 9 cm and you use 3.14 as an approximate value for π, what is its approximate circumference?

• 28.26 cm

• 56.52 cm

• 84.78 cm

• 113.04 cm