Which type of things are used to measure the length of a curved line?

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Ruler

Measuring tape

Thread

Stopwatch

answer is C.

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Detailed Solution

A thread is used to measure the length of a curved line.
For measuring the curved lines, we require things that can easily be deformed into the curved pattern. A thread can be used for measuring the curved lines since it can be deformed into any required curve and with the help of a ruler, we can measure the length of the thread portion that is used for measuring the curved part.

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