http://www.interactivestuff.org/sums4fun/3dboxes.html
http://www.scholarnet.co.nz/member/courses/smol/data/site/flash_apps/Measurement.php
http://www.zsdobrichovice.cz/ukoly/matika/testy/testy.php?go=m7_36
http://www.mrbartonmaths.com/resources/keystage3/shape/Volume%20and%20Surface%20Area%20of%20Cuboids.swf
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