1. Find the circumference of a circle with a diameter of 8 cm.
2. The hour hand of a clock is 8 cm long. Calculate the distance traveled by the tip of the hour hand in 2 ½ hours.
3. What is the circumference of a circle if the radius is 7 cm ?
4. Given that the area of a circle is 3850 cm squared, what is the radius ?
5. Find the diameter of a circle which has an area of 38.5 cm squared.
6. Find the area of a circle that has a circumference of 88 cm.