Area of a Circle
4 Steps
In this instructable I will show you how to calculate the area of a circle
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## Step 1: What You need

You need a straightedge

a pencil (or pen whatever you want...)

a compass

a protractor and a calculator (or your mind!)
cyberpageman says: Sep 2, 2009. 1:37 PM
Uh, are you saying the area of a circle is πr2?
bassclarinet23 says: Dec 27, 2009. 12:47 PM
Yes, that is the common equation.
meh301 (author) says: Sep 3, 2009. 9:42 AM
yes
kwah says: Mar 12, 2009. 4:41 PM
More commonly, 'Z' (as you have called it) is given the letter 'r' for 'radius'.

Area (A) = pi * r2
(spoken as 'pi-r-squared')

Other than this, a nice and concise instructable - 4.5 stars for you =]
meh301 (author) says: Jan 28, 2009. 12:36 PM
sorry about the unknown letters. The unknown letters in front of the examples in step 4 is the sign "pie" and the letters after the examples is a mini 2 (for the square root)
meh301 (author) says: Feb 7, 2009. 4:54 AM
Ok I fixed the problem