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Measuring a curved line using a string:
Materials needed:
A meter scale, a measuring tape, a string and a sketch pen.
- Use a thread to measure the length of the curved line \(AB\).
- Put a knot on the thread near one of its ends.
- Place this knot on the point \(A\).
- Now, place a small portion of the thread along the line, keeping it taut using your fingers and thumb.
- Hold the thread at this end point with one hand.
- Using the other hand, stretch a little more portion of the thread along the curved line.
- Go on repeating this process till the other end \(B\) of the curved line is reached.
- Make a mark on the thread where it touches the end \(B\).
- Now stretch the thread along a metre scale.
- Measure the length between the knot in the beginning and the final mark on the thread.
- This gives the length of the curved line \(AB\).
Important!
This is a activity-based exercise. Write the answer in a sheet and compare it with the solution given below.
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