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There's a few ways to do it: Use a compass. I know you said yours is too small, but you can buy a carpenty or woodworking compass that is much larger (foot or more). Tie a string to your pencil...
Answer
#1: Initial revision
There's a few ways to do it: * Use a compass. I know you said yours is too small, but you can buy a carpenty or woodworking compass that is much larger (foot or more). * Tie a string to your pencil, keep one end of the string fixed with your finger or something else (toothpick, nail, other pencil) while you rotate the pencil while keeping string taut. * Fix the center of the plywood (for example, by pinning it down with a nail), hold the pencil in place, and rotate the plywood. And, one for fun more than practicality: Hang a flashlight above the plywood. It will probably make a circular pattern that you can trace. You can vary the radius by adjusting the height.