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NonagonsTHINGS TO DOYou should have five acute and two obtuse Isotiles.On the left is a regular nonagon: nine equal sides and nine equal angles. Can you put all seven Isotiles together, so that you also make a nonagon? You will not be able to build on the previous shape - so start a new type of solution. Clue: you will have a reflex angle in your shape. Work out the sum of all nine angles of this shape, by adding together all the angles of the Isotiles. |
