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If a circular piece of tin has a measure...

If a circular piece of tin has a measured radius of 2.6 cm . What is circumference ?

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r=26 cm
Circumferece of circular disc = 2pir
`=2xx3.1428xx2.6`
Here 2.6 has only 2 significant digits. Hence in the above multiplication `pi` value should be written with 2+1 =3 significant figures. `pi = 3.1428 =3.14 `
Circumference =`2xx3.14xx2.6`
=16.328
This is to be rounded off to 2 significant digits. Circumference is 16cm.
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