ABOUT THE OVAL (DOVAL)

摘要

In this paper, we mention about the oval and it's new name (Doval). First, we explain the reason of naming the Oval as Doval. Next, we explain it's Definitions and Some properties and theorems, those are old and new results. And more, we describe the confocal curve of Extended Doval (chocoid), this Extended curves are defined using Orthopole theorem and they are drawn by Maple Soft. At Last, moreover we show the figure of one Extended Doval curves (Tajicoid). We append unsolved problems of Doval. We must appreciate Rapid CAD and Maple developers.