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To measure the length of an object, choose the correct tool for measuring it, like a ruler for small, flat items, or a measuring tape for items with curves. Then, line up the zero mark on your measuring tool with one end of the object. Make sure to keep your measuring device perpendicular to the edge of the object so you get an accurate measurement. Finally, note the number on your tool that’s closest to the other end of the object. For tips on how to measure using the metric system, keep reading!
Source: Wiki How