Question

Which of the following will you use to measure the length of a curved line?

• A. Only thread
• B. Only geometric scale
• C. Iron bar
• D. Thread and geometric scale

Answer 1

The correct option is D Thread and geometric scale

A thread and a geometry scale are used to measure a curved line.
We use the flexibility of the thread to align it along the curved line that has to be measured.
Then, we keep the thread straight and measure its length with the scale.