Name________________                                  Date_________________
Discovering Pi


How well do you understand circumference?
Directions:  The purpose of this worksheet is to see how well you understand the activity “Discovering Pi.”  Read and fill in the information below as carefully as possible.  Proofread your work before turning it in.  Ask yourself “Do my answers seem reasonable?”

1. The circumference of a circle is about ______ times greater than its diameter.

2. This numerical relationship is called _______.  The symbol used to represent this idea is _____ and its value is _____. (rounded to the nearest hundredth)

3. Write the formula for finding the circumference of a circle. ______________________

Estimate the circumferences for these circles.

1. d = 10 cm		2. d = 25 ft		3. d = 4.5 cm		4. d = 2 m


   C = ______		   C = ______		   C = ______		   C = ______


Determine the exact circumference of these circles.  Write the formula each time to help you remember it for later.  Show your work on the back of this sheet.  When you finish, check each problem with your calculator.


5. d = 34 mm		6. d = 5.6 in		7. d = 115 cm		8. d = 7.2 m


   C = ______		   C = _______	  C = _______		   C = _______