 Six of the dodecagon's sides have edge length 7, and the other six have edge length formula_1, with edge lengths alternating.The total area of each piece is exactly that of 6 equilateral triangles, and the area of the dodecagon is exactly 1254 equilateral triangles' worth.The puzzle was launched in June 1999, by Ertl, marketed to puzzle enthusiasts and 500,000 copies were sold worldwide, with the game becoming a craze at one point.