A jigsaw piece is formed from a square with a combination of ‘tabs’ and ‘slots’ on at least two of its sides. Pieces are either corner, edge or interior, as shown. corner piece edge piece interior piece (two straight sides at right angles) (one straight side) (no straight sides) We treat two shapes as the same if one is a rotation of the other, without turning it over. How many different shapes are possible?
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Australian Mathematics Competition 2017 - Junior (2017)
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