Blackboard can be any shape you want. Most blackboards are rectangular.
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Meter is used in finding the width of the blackboard.
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The length of a blackboard can vary depending on the specific blackboard in question. Standard sizes for blackboards typically range from 1.2 meters to 3 meters in length. This would be equivalent to 120 cm to 300 cm or 0.0012 km to 0.003 km. It is important to measure the specific blackboard to determine its exact length in meters, kilometers, or centimeters.