Find the circumference of a circle with a radius of 4cm.

The area of the shaded region in the above diagram is . Give the circumference of the circle.

You are exploring the woods near your house, when you come across an impact crater. It is perfectly circular, and you estimate its area to be .

What is the circumference of the crater?

Let

Find the circumference of a circle with a radius of 8in.

A circle has a radius of 5 miles, what is its circumference?

You want to ice skate around the outer edge of a circular pond (the water is frozen, because it is January and you live in Wisconsin). If the pond has a radius of 35 meters, how far will you skate in one lap around the pond?

You have a circular window in your vacation room. It has a radius of 9 inches. What is the circumference of the window?

You are conducting fieldwork, when you find a tree whose radius at chest height is . What is the circumference of the tree at chest height?

Find the circumference of a circle with a diameter of 18cm.

Find the circumference of a circle with a radius of 10in.