Standard Unit of Length - Metre, The length of a curved line can be measured using - thread , 1 Km = - 1000 mm , 1 m - 100 cm , unit used measure distance between two cities - kilometre, The thickness of book can be measured in  - cm, 1340 is how many km - 1.34 km, movement of a rocking chair - Periodic , Movement of a giant wheel - Circular , hand span - non standard unit of measurement ,

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