Geometric drawings, ratios, number theory and geometry, geometric art, construction of regular polygons, tessellations and other visual mathematical concepts. Some of the information provided might not be correct .
Visual Geometry Dec 2020
Nonagon, 9-gon
Heptagon , one unit lines
Hendecagon
Square tessellation
Squares
Heptagon
Hendecagon, 11-gon
Square root 2 and golden ratio, 5x5 grid, 8x8 grid, triangle, square