Virat is given the task of measuring a snake-like steel rod which looks something like this
Which of the following objects/methods should he use to make this measurement?
A thread of known length
Virat cannot use a meter scale as it cannot be bent along the curve. If he uses pieces of marbles, there will always be some gaps left between two marbles. A thread of known length can be used to measure the required length as shown in the diagram below.