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Nick Halsey uploaded a new app: Tridecagon Diagonal… 11 years, 8 months ago
You’ll want to start out with the heptagon and work your way up. This one’s the same as all the others, just with a 13-sided regular polygon. Observe the tangencies to diagonals of circles centered at intersections of diagonals, when the circles are resized (by dragging).This is a smaller version that works well on most monitors (zoom in with two-finger touch). B…