7615
/www/nrich/html/content/id/7615/
1
2011-07-14T11:59:49
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<div>Use the interactivity to investigate the number of colours that are needed for different types of symmetric $n$ by $n$ tablecloths, where $n$ is even.</div>
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<div>Click <a href="http://nrich.maths.org/7615/clue">here</a> for instructions on how to use the interactivity.</div>
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<div><mdo:flash height="400" width="550"><param name="allowfullscreen" value="true" ></param><param value="true" name="allowfullscreen" ></param><param value="true" name="fullscreen" ></param><param value="/content/id/7615/Tablecloth_even.swf" name="movie" ></param><param value="10" name="flashplayerversion" ></param></mdo:flash></div>
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<p>Click <a href="/900">here</a> to return to the problem.</p>
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<p><span style="font-weight: bold;">Instructions for the interactivity</span><br></br>
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Click on the colourbar to choose a colour, then click on your chosen squares of the tablecloth to colour them in. Once you've finished with the first colour, choose a new colour from the colourbar.<br></br>
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If you make a mistake, you can just select a different colour and click over the square you want to change.<br></br>
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If you run out of colours, tick the "With Dots" box for extra colours with dots.<br></br>
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Once you have finished, click "Check" to see if your design satisfies any of the symmetries, and if you have used the maximum number of colours.</p>
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Tablecloth Interactivity - Extension
Interactivity for Attractive Tablecloths extension