Instructions
Choose a center point for your circle, and lay one block in its place.
Determine the circle's diameter. For an even circle, it is best to choose an odd-numbered diameter.
Lay four radial blocks around the circle's center point so that they form an even cross. The length of the radial points will be one half of the circle's diameter.
Connect the radius points with blocks to make a circle. The diameter of the circle will dictate how the connectors are laid out. See the Resources for a diagram guide for arranging blocks according to the circle's diameter.