Select Board & Class



  • The ancient people use hand-span, foot-span, finger width, palm length, the distance of a step, etc. as a units of measurements. All of them are non- standard methods of measurement.
  • This types of measurements are not accurate. 
  • The measurement of a quantity is expressed in two parts, one part is a number and the…

To view the complete topic, please

What are you looking for?