{"type":"rich","version":"1.0","title":"Squares. BF = 7 / 2 = 3.5","html":"<iframe src=\"https://www.desmos.com/calculator/ek9iuvipxj?embed\" width=\"500px\" height=\"500px\" style=\"border: 1px solid #ccc\" frameborder=0></iframe>","width":500,"height":500}