DescriptionAcadem Regular polygons built with a golden puzzle.svg
English: This jigsaw puzzle is instructive, because the principle of gnomons provides a good mnemonic to remember some geometric shapes and some mathematical properties.
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More thick sides in a new colour for the stellated decagon, and one convex decagon added in this style; a blue background behind the small pentagon apart, formed with three puzzle pieces.
{{Information |Description ={{en|1=Someone that plays with this puzzle can acquire knowledge, because the principle of gnomons provides a good mnemonic to remember some geometric shapes and some mathematical properties.}} |Source ...