How to measure length of a Curved Line?

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What is Curved Line? A line which continuously changes its direction and is not straight is called curved line How to measure length of a Curved Line? Option 1 Use Scale Problem We cannot accurately measure the length of a curved line using a scale because a Metre scale cannot be bent to make it curved. How to measure length of a Curved Line?Option 2 Use Thread or Flexible Measuring Tape Benefit Measurements can be made with the help of a flexible measuring tape or by using a thread as shown in Figure. The thread can then be straightened and its length can be measured using a scale. Which type of material should we use to measure Curved Line?If we use any stiff object, then we will not be able to bend it to measure curved line . Example - Plastic Scale If we use a flexible object, then it can change shape and direction. We can measure curved line easily with it. Example - Thread, Wire Thread Wire