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'Tangram Paradox' printed from http://nrich.maths.org/

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Just how can the same seven pieces of the tangram make the following two silhouettes of a bowl before and after it was chipped?

two tangrams

Paradoxical eh? (There are other paradoxes that can be found using the tangram which you might like to find out about.)

See if you can make the two bowls using the interactivity below.

Can you explain the paradox?

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