Finding the center of a circle on the other hand wasn't quite as intuitive to me, and until doing some searching of my own, I didn't know that there was a simple and easy trick. Time to share.

Similar circle finding Instructables can be found here:

http://www.instructables.com/id/Find_the_Center_of_a_Circle

http://www.instructables.com/id/How-to-Find-the-Center-of-a-Circle

**Signing Up**

## Step 1: Draw some chords

They are easy to draw...simply take a ruler, place it down on the edge of your circle so that it crosses the outer edge in two places, and use a pencil to mark a line. You've just created a chord.

Technically to find the center of a circle you only need one perfectly drawn chord but since people aren't machines and there's some user error in the process, draw a couple so that you can average the results.

I've drawn five chords near the perimeter of the circle in the photo below. Disregard the lines pointing in towards for the center for the time being.

## Step 2: Mark the centers and draw a perpendicular line

Mark that point.

Then, using a square, draw a line that is exactly 90 degrees to the chord pointing towards the center of your circle. Make it a little longer then where you think the center of the circle resides.

Do this for all of your chords.

## Step 3: The center is the point where they intersect

This means that the system works...ain't geometry cool?

Check this video out

http://www.youtube.com/watch?v=YOJbWo41gU0

And must be done with a compass. Using a rule introduces some error, unless you have excellent tools, you are excellent drawings lines... Although compasses are usefull on paper, using with an already cut circle can be hard to set the compas in a border. Anyway in my opinion, using the compass still is more accurate than using a rule.

But really any method is valid if you accomplish your goal. :)

1. Set ruler down across circle at any point.

2.Trace both sides of ruler onto circle.

3.Measure each of the two lines and mark their centers.

4.Use ruler to connect these two marks and extend to edges of circle.

5.Measure that lines center point and you have found your center!

Its a fast method that should get you at least as close to the absolute center as the method shown here and only requires a ruler and pencil.

Cheers.

Take a square, align the outside of the rectangle with any point inside the circle. Mark down on the circle, the two points where the sides of the square intersect the circle. Draw a line connecting these two points. You have just traced a diameter.

Repeat the process in a diferent location and get another diameter. Where the two diameters intersect, there is the center

No compass, no measurents, no duvisions. Just a (90 degrees) square.

"

Life is pointless, without geometry."Note: You will get better results if you use a compass to find the midpoints.

Or perhaps we should slam on people who write I'bles about using pre-existing Windows facilities, like streaming audio, since they are already clearly documented, so who needs yet another set of instructions? I don't subscribe to that point of view.

XD

But hey we have been doing "it" for a while.

XD

Just because we've got one of something of already doesn't mean that we can't have some more does it?

I don't have a brain scan or anything to prove this, but I bet that I store my knowledge of woodworking skills in a pretty different place than I store Barbara Heally, my 10th grade math teachers geometry lessons...ugh, that woman still give me the shivers...Barbara - if you're out there - screw you!