Using a Divider to Measure Length
A divider is used to measure the distance between two points. The correct use of a divider can give a fairly accurate measurement. The divider is placed  such that its two points are at the two ends of the length to be measured. Then, without disturbing the divider, the distance between the two points is measured with  a ruler .

Measuring the Length of a curved Line
We can measure the length of a curved line by using a string. The string is placed along the curved line and its ends are marked on the string The length of the string between the marked points is measured with a ruler .

 

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Standard Units of Measurements

Metre: It is the standard unit of length. The symbol of metre is m.

Standard Measures: Measures that are the same all over the world are known as standard measures.

A unit of measurement which has fixed value and which does not change from person to person or place to place, is called standard unit of measurement.

Standardizing length measurement

  • Scientists from all over the world have accepted a common standard unit of measurement.
  • The International System of Units (S.I unit) was set up as the convention for measurement worldwide.
  • A metre is the SI unit of length. It has 100 equal divisions called centimetres.
  • Metre: It is the standard unit of length. The symbol of metre is m.

  • To measure large distances, we use kilometres. 1 Km = 1000 metres.

Nowadays, the International System of units or the SI units have been accepted all over the world as a standard unit of measurement.

1 m = 100 cm

1 kg = 1000 g

1s = 1/60 min

The MKS system i.e. the Metre-Kilogram-Second system is called the SI System.

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