A ruler, or rule, is an instrument used in geometry, technical drawing and engineering/building to measure distances and/or to rule straight lines. Strictly speaking, the ruler is essentially a straightedge used to rule lines and the calibrated instrument used for determining measurement is called a "measure". However, common usage is that a ruler is a calibrated straightedge that can be used for making measurements.




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![Remarkable Recycled Flexi Ruler 30cm Blue [Pack of 5] Remarkable Recycled Flexi Ruler 30cm Blue [Pack of 5]](/uploads/images_products/33524.jpg)







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