The diameter of a sphere is 4.24 m . Calculate its surface area with due regard to significant figures.

Explanation

Deameter `d=4.24m`
Radius`r=d/2=(4.24)/2=2.12`
surface area of sphere `=4pir^(2)=4xx3.1428xx2.12xx2.12`
In the above multiplication `2.12`has 3 significant figures. It becomes `3.143`.
Surface area `=4xx3.143xx2.12xx2.12=56.50`
`56.50` this to be rounded off to have 3 significant figures.
`:".Area is" 56.5`