Question

The length of a curved line can be measured by using a ----------​

Answer 1

HEY MATE ! Here is your answer !!

A non-stretchable string or thread is used to measure the length of a curved line. First place the ruler along the edge of the object whose length is to be measured, with the zero mark of the ruler placed at one end of the object.

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Answer 2

thread is used to measure any curved line