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See mathstodon.xyz/@unknown/101273 for a festive two-to-one star dissection. Merry Christmas, everyone, or whatever your appropriate seasonal greeting might be!

Many thanks for introducing! 

@11011110 Coincidentally This basically method of is found in puzzle book written by "Gisaku Nakamura" (I forget book's title) amazon.co.jp/%E4%B8%AD%E6%9D%9 , I applied it to triangles and so on about a year ago twitter.com/wasanp_/status/962 (like a attached image). Probably these first method are invented from "Mr. Henry Ernest Dudeney's hinged dissections" commons.wikimedia.org/wiki/Fil , Thanks all!

By the way, in some cases it may be more suitable the another method… 

For reference, Japanese Puzzler "Puzzdog's dissection method" puzzdoghouse.blogspot.com/2014 may be more suitable in the other case (Dudeney's method is not suitable?). For example, but not a good example twitter.com/wasanp_/status/954

Although, Dudeney's method is nice. I call that name of this attached is "Santa Transform". Thank God It's !

Although, "Puzzdog's dissection" method is suitable for converting parallelograms at equal angles (cf. Attached image is a method of combining similar triangles (It is described in the book of 細矢治夫ら著『多角形百科』 amazon.co.jp/dp/4621089404/
.).). I used the method to mathstodon.xyz/@unknown/101280

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