Model : Rectangular trapezium envelope by Francis Ow
Special : The envelope is one of the tangram T-pieces inside is the folded tangram.
Diagram published in BO mag 267 (April 2011)
and in
Francis Ow website
Special : The envelope is one of the tangram T-pieces inside is the folded tangram.
Diagram published in BO mag 267 (April 2011)
and in
Francis Ow website
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