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four and a half inches by one and a half inches
1.647 meters
Most likely 50 mm by 100 mm.
When you use an actual calibrated tool to measure it and not just guess based on appearance...
A standard ruler's actual size is 12 inches long. Rulers may be plastic, metal or wooden. Often rulers have metric measurements on one side even though the metric system is not used in the United States, at least not for official purposes.