To make rounded corners I measured 3" in from corner, drew a perpendicular line at that point using my T-square, and then placed the saucer at designated measured points and drew the curved corner.
Before cutting the corners, clamp the wood to a table, making sure the area you are cutting is positioned away from the edge of the table, leaving you enough room to cut without cutting into the table. Using a jigsaw, I lined up the blade with the 3" mark and started on low power, increasing power as I went.
