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## 'Tessellating Hexagons' printed from http://nrich.maths.org/

Is it true that any convex hexagon will tessellate if

- it has a pair of opposite sides that are equal, and

- three adjacent angles that add up to 360 degrees?

You may assume that the adjacent angles that add up to 360 degrees
are "in between" the equal sides, as shown in the diagram.

Can you show that it will always be true?

Can you find a counter example?

This problem appears in "Tiles and
Tiling", an activity book published by the Association of Teachers of
Mathematics