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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.
 
Method:
  1. Use a thread to measure the length of the curved line \(AB\).
  2. Put a knot on the thread near one of its ends.
  3. Place this knot on the point \(A\).
  4. Now, place a small portion of the thread along the line, keeping it taut using your fingers and thumb.
  5. Hold the thread at this end point with one hand.
  6. Using the other hand, stretch a little more portion of the thread along the curved line.
  7. Go on repeating this process till the other end \(B\) of the curved line is reached.
  8. Make a mark on the thread where it touches the end \(B\).
  9. Now stretch the thread along a metre scale.
  10. Measure the length between the knot in the beginning and the final mark on the thread.
  11. 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.