hexagon is
the orange shape?
this work has been developed and discussed in detail by Derek Ball and Barbara Ball (MT March 2008)
the bottom right-hand picture is a useful starting place
folding bits inwards needs some additional justification - but is a helpful insight/start
the top left picture can also use this way of viewing (folding technique) to help establish the fraction
the other two pictures can be seen as repeated applications of this technique
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