I have a doubt

Now, ask your teacher to measure your with his handspan. of my teacher's My desk is handspans long. Why is there a difference? This is because your handspan is smaller than your teacher's handspan. What can be the problem if you be 5 handspans long'? How can Then we measure something, we need therwise our measurements will not b tandard unit. timetre measuring the length of things such ook, we use a standard unit called written in short as cm. Your finger an use a ruler to measure the leng uler is 15 cm long, It can be used