[English] Considering you need an angle where you can't use magnetism this will indeed be very difficult in Sweet Home 3D. I'm very familiar with the concept because I use the 12-sided form a lot (dodecagon) but for that I can use magnetism for angles.
Using the Multiplier plugin as Hans suggested might get you close to what you want but this is one of those rare situations where I would use Blender to create a guide. In Blender you can simply use a default cylinder and set the number of vertices to 21 (automatically resulting in the required angle) and set the radius and height. This will give you a solid cylinder you can export as a Wavefront obj file that you can import in Sweet Home 3D.
Resize the cylinder to the inside dimension of your yurt. Make sure you use "keep proportions" when modifying the cylinder. Create a room using the cylinder's corner points as a guide. Make the cylinder invisible. Select 'create wall' and double-click on the room. This will create the walls around the outside of the room.
Keep magnetism off when you do anything with the walls, otherwise they snap to a different angle.
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Draw a rough outline of the walls you need, counter-clockwise for the wall direction. Join the last wall to the first. No need for precision, you get that by modifying each wall using the coordinates in the table to set the X and Y start and end points. The first set of coordinates is for the left of the top 2 wall parts so position your rough walls where that wall part starts close to 0, -1344. It's a lot of work but you get the exact walls you need (length 1359.2 so 8mm short). Remember to keep magnetism off.
You realize that's a 90 meter diameter yurt? And that your angles are 17.1°, not 16.36°?
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