A geometry compass is a tool specifically designed to draw and measure circles. Buy one in a school or office supply store![1] X Research source
Consider using a pencil to sketch your lines. This way, you can erase the marks once you’ve found the center. Draw with a light touch so that it’ll be easier to erase.
Draw these circles in pencil, not pen. The process will be simpler if you are able to erase these circles later on.
