Ruler (English: Ruler) as the device geometry and artistic works may be made from wood, plastic, aluminium or steel is used to measure the length of the majority, there will be a 2-inch and centimeter scale is found in several sizes, most of them 15 or 30 cm size. 100 cm (1 m) for the temple construction. In addition, we may also use the ruler to underscore, which causes the primary students will need to keep the ruler
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In pictures with a ruler and a circus. The ruler used to measure the scale is not required as long as a normal ruler. So we discussed a ruler that measures in length is not that San (Straightedge).
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