Question

Explain two methods that you can use to measure the length of a curved line. [5 marks]

Answer 1

Measuring the length of a curved line, by two methods.

First method – using a string. [2.5 marks]
1. Draw a curved line AB on the paper.
2. Place a string along the curved line.
3. Make sure that the string covers e very bit of the curved line.
4. Mark the points where the curved line begins and ends on the string.
5. Now stretch the string along the length of a meter scale.
6. Measure the distance between two markings of the string.
7. This will give the length of a curved line.

Second method – using a divider. [2.5 marks]

1. Draw a curved line AB on a paper.
2. Separate the legs of the divider by 0.5 cm or 1 cm using a ruler.
3. Place it on the curved line starting from one end. Mark the position of the other end.
4. Move it along the line again and again cutting the line into number of segments of equal lengths.
5. The remaining parts of the line can be measured using a scale.
6. Count the number of segments.
7. Length of the line = (No. of segments × length of each segment) + length of the left over part.