Question

How can you measure the length of a curved line? Explain by drawing a suitable diagram.

Answer 1

To measure the length of a curved line, we can use a piece of string.
Take some pins and fix them vertically on the curved line wherever the edge of the object changes its direction. Tie a knot on a thread at one end of the object. Pierce a pin through this knot and fix it at one end of the curved edge. Stretch the thread along the pins and get it marked with a pen where it touches the last pin. Measure the length of the thread from its knot to its other end by stretching it along a ruler. This gives an approximate length of the curved line.