I am looking for a possibiliy to draw a polygon with specified edge length in QGIS Madeira. I already checked further Threads belonging to this question, but all answers refer to PlugIns which are not correspondig with the current GIS Version.
If I understand you correctly
1) Create a center point;
2) Run the
Data Analysis>Vector geometry> Rectangles, ovals, rhombuses (fixed),
see figure 1.
In the test example, I set the values in the above meters 111.2 x 22 meters (in length and width), You can also create the rotation you want, etc.