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carpenter's square
The carpenter's square has a 24-inch blade and a 16-inch tongue, forming a right (90-degree) angle. The blade and tongue are marked with inches and fractions of an inch, or their metric equivalents. The blade and the tongue can also be used as a rule or a straightedge. Tables and formulas are printed on the blade for making quick calculations such as determining area and volume. Related category• TOOLSAlso on this site: Encyclopedia of Science Encyclopedia of History |