The early units of measurement of length is:

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Metre

Centimetre

Millimetre

All of these

answer is A.

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Detailed Solution

Concept- We use measurements to compare two objects. We measure the size of the object in the measurement. If the object is linear, we measure its length. If the object has two dimensions, we measure its length and breadth; if it has three dimensions, we measure its length, width, and height.
Length: The length of an object indicates how lengthy the object is. Simply put, we measure the distance between two points to determine the length of an object. The length is used as the basis unit in SI and other unit systems, and many units are produced by utilising this unit as a base unit.
The length measurement is represented by a number with a length unit, and our measurement system has several length units. If one can measure an object in metres, others can measure it in centimetres, and these length units have a connection that makes them interchangeable. The four units of measurement for length are as follows:
Metre, Centimetre,Millimetre,Kilometre
In our SI system, the basis unit of length is the metre, but in the CGS system, the basic unit of length is the centimetre.
Hence, option 1 is correct.

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