Lindgren's Dissection of One Decagram {10/3} into Two Pentagrams {5/2}

This Demonstration shows Lindgren's dissection of one decagram {10/3} into two pentagrams {5/2}.

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The notation means join every vertex of a regular -gon.
G. N. Frederickson, Dissections: Plane & Fancy, New York: Cambridge Univ. Press, 2002 p. 173.
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Related Curriculum Standards

US Common Core State Standards, Mathematics