How to Determine the Major and Minor Axis of an Ellipse if Two Conjugate Diameters of it were Determined

Ellipse is also used widely on the surfaces of machine parts and appliances. So we must draw many ellipses in engineering drawings. Technical drawing books (TDB) and technical graphics software (TGS), for example: Autocad, Solidworks, Solid Edge. . . only give us a way to draw the ellipse when the major and minor (MNA) of it were determined. There are no documents and technical graphics software that shows how to draw the ellipse when two conjugate diameters (COD) of it were found. Especially, when we draw orthographic projection, we need to draw many ellipses that two conjugate diameters are determined. That is difficult for the software users. This article will show you how to find the major and minor of the ellipse if two conjugate diameters of it were determined. Finally, we can use the ellipse command of the software or we can write a subroutine to draw an ellipse.