The blue piece is 10x10. I painted the board four times, drew a grid, used a template for the circles and then added the dots.
The other piece, which is beige (14x14), required taping and drawing the cross and the square on point. I did end up needing a compass for the larger circles. I am learning so much. I really don't use acrylics so finding out that you need more than a 1/8th inch amount of paint on the brush is the first step. Also, one needs to work from the center out. So it is wise to have the design pretty thought out.