Easy Method to Find the Center of a Circle

Circles have an unusual geometry: they are the most regular, most symmetrical shape possible; but because there are no corners, finding one's center is harder than you might expect. To find the precise center of a square or rectangle, you only need to draw lines from the opposite corners: the center is the point at which they cross. The trick to finding a circle's center is creating corners of your own to use. For small circles, all you need is a piece of paper, book or some other object with a right-angle corner. If the circle is larger, a sheet of plywood or some other solid rectangle will do the trick.