# Area of a Circle

2,793

6

6

## Introduction: Area of a Circle

In this instructable I will show you how to calculate the area of a circle

## 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!)

## Step 2: The Area of the Circle........well Not Really

Ok, to start you have to first find the middle of the circle!

1st you have to draw a line anywhere around the circle. Make sure the line is outside of the circle but touching the circle (see image two). Next you have to draw a 90 degree angle using your protractor. Do this method until you find the middle (do this 3 or more times).

## Step 3: Now It's Time to Find the Area of Your Circle!

1st, draw a precise line with your straightedge from the middle to the edge of your circle. We will name this line "Z" but please use "r" for a test, i just like "Z" more. Next, measure the line you made.

Note: The actual abbreviation for inches is "in."

## Step 4: Calculating!

The initial calculation is "Pi Your measurement squared" or more precise, "Pi Z squared". The last thing to do is calculate it! If you want to calculate the answer on paper (without a calculator), the approximation of pie is 3.141592654...

Now you know how to calculate the area of a circle! First Prize in the
Burning Questions Round 6.5 Participated in the
Burning Questions Round 6.5