Which of the following objects/methods should we use to make the measurement of this object?

Meter scale

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Pieces of marbles whose length is known

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A thread of known length

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It is impossible to measure the length of a curved line

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Solution

The correct option is C
A thread of known length

We cannot use a meter scale or centimetre scale as it cannot be bent along the curve. A thread of known length can be used to measure the required length as shown in the diagram below.

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