A section of a grille made up of straight and curved iron bars. The length of the straight bars can be measured using [[1]], and curved iron bars can be measured using [[2]].

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Detailed Solution

A section of a grille is made up of straight and curved iron bars. The length of the straight bars can be measured using measuring tape, and the curved iron bars can be measured using thread.
The length of the grille's straight iron bars can be measured with a measuring tape. A metre scale or tape cannot be used to directly measure the length of a curved line.
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So, we can use a thread to measure the length of the curved line, which can then be measured using a scale. As a result, the whole length of the grill may be measured accurately.
The straight iron bars can be easily measured by measuring tape, a thread can measure the curved iron bars, and then the thread length can be measured by measuring tape.

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