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2011-02-01T00:00:01
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<mdoxml version="1.0"><p><a href="https://nrich.maths.org/8045">First Forward Into Logo</a><br></br>
<strong>Previous:</strong> <a href="http://nrich.maths.org/public/viewer.php?obj_id=4856&part=">FF7</a></p>
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You might like to learn some more Logo by going to <a href="http://nrich.maths.org/public/viewer.php?obj_id=4863&part=index">Muggles, Logo and Gradients</a> where you will use Logo to throw light on a very puzzling problem called <a href="http://nrich.maths.org/public/viewer.php?obj_id=782&part=index">Muggles Magic</a> .<br></br>
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Consider the following procedure:<br></br>
TO PATTERN :SIZE<br></br>
REPEAT 5 [FORWARD :SIZE RT 144]<br></br>
END</p>
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<div>What is different about this procedure?</div>
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<div>Did you notice :SIZE ?</div>
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<div>It is called a VARIABLE .</div>
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<div>It is always written in a particular way using a colon.</div>
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<div>What do you think this is about?</div>
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<div>What does the word variable suggest to you?</div>
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<div>Why not type in the procedure above and then copy the following:</div>
<div>PATTERN 30</div>
<div>PATTERN 60</div>
<div>PATTERN 120</div>
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<td><mdo:image alt="PATTERN" height="270" src="logo11.gif" width="244"></mdo:image></td>
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<p>Or experiment with different numbers for yourself and see what patterns you can produce.<br></br>
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Are you feeling happier with the idea of a variable? If so why not explore further this idea of using a variable in those procedures you have met previously.<br></br>
TO SQUARE :SIZE<br></br>
REPEAT 4 [ FD :SIZE RT 90]<br></br>
END<br></br>
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TO HEXAGON :S<br></br>
REPEAT 6 [ FD :S RT 60]<br></br>
END<br></br>
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TO DODECA :S<br></br>
REPEAT 12 [BK :S LT 30]<br></br>
END<br></br>
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<p><strong>Next:</strong><a href="http://nrich.maths.org/public/viewer.php?obj_id=4857&part="> FF9</a><br></br>
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First Forward into Logo 8: More about Variables
Write a Logo program, putting in variables, and see the effect when you change the variables.
Algebra
Introducing algebra
Information and Communications Technology
Logo
Using, Applying and Reasoning about Mathematics
Practical Activity