Circle: Circumference

1. Find the circumference of a circle with a radius of 12 inches.

2. Find the circumference of a circle with a diameter of 8 inches.

3. Find the circumference of the circle: 

4. Find the circumference of the circle: 

5. If the circumference of a circle is 942 feet, what is the length of the diameter?

6. Find the circumference of a circular ampitheater if the length across its center is 450 feet.

7. If a circular room has a radius of 25 feet, what is the circumference of the room?

8. If a circular field has a diameter of 25 feet, what is the circumference of the field?

9. If the circumference of a swimming pool is 188.4 feet, how long is the radius of the swimming pool?

10. You want to wrap a ribbon around the bottom of a skirt that forms a circle when laid out flat on the ground.  If the measurement from the center of the circle to the edge of the skirt is 16 inches, how long a ribbon do you need?