# How To Find the Center of a Circle

This is a handy trick that I learned for finding the center of a circle.

I made my girlfriend and I phone holders with steel discs for their bases. I had to drill and thread a center hole in each base for the articulating arms.

To figure out where I needed to the drill the center of the hole at, I used the method detailed below.

## Materials needed:

- Ruler
- Sharpie marker

**Step #1:**

Make two equal length lines parallel to each other on the circle. In my case, I chose to use 3” long lines. So on the top of the circle, find where its width is 3” and make a straight line across. Then on the bottom of the circle, find where its width is 3” and make a straight line across there, too. You can use any width you’d like, as long as they’re the same length.

**Step #2:**

Once you have two equal length lines parallel to one another, you can then connect them as pictured. You’re making an X between the two lines.

**Step #3:**

You’re all done. Where the two lines of the X meets will be the center of the circle.