This might could help
http://diy.stackexchange.com/questions/998/what-are-the-different-gauges-of-electrical-wire-availabl...
Because the shadows are being cast at the same time of day, they have the same proportions. (4*21)/6=the length of the shadow of the tree =14ft
<span> eukaryotic cells are both cells of plants and animals</span>
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