Circumference of a Circle

In this Instructable, we will dive into the exciting world of Circles.
Specifically the Circumference of a Circle.

Supplies:
Pencil (needed for it's erase-ability)
Paper
Calculator (to check your answer)

Step 1: Circle

Some basics of the Circle:

Circumference - the distance around the circle (aka the perimeter of the circle)
Radius - the distance from the center to any point on the circle
Diameter - the distance from a point on the circle to another point on the circle going
through the center (also twice the length of the Radius)
Pi - the symbol that represents the value 3.14 (actually Pi is a never ending number, but for our purposes 3.14 will be fine)

Comments

[notanemo]

off the top of my head, pi is equal to 3.141592653589793. i have it to a million on my comp

[mrpesas]

I only have it memorized to 3.14159.  I like to show my students the websites that let you search for your b-day, phone number, ss#, etc in pi
like this
http://www.angio.net/pi/piquery

[joen]

in example 2 of step 2 you show that the radius is 12 in. Don't you mean the diameter?

[mrpesas]

You are correct.  Thank you for pointing it out.  I fixed the page. :-)

[thepelton]

I know it's not as precise, but 22/7 works for a close guesstimate.