Question

The radius of a circle is 2.12 m.its are according to the rule of significance

Answer 1

Answer:

Rule of significant says that it is important to be honest when reporting a measurement ,so that it doesn’t appear to be more accurate then the equipment used to make the measurement allows. We can achieve this by controlling the number or digits, or significant figure .

Here radius = 2.12 m , which having 3 significant number

So for area we should give the ans in 3 significant no .

Area of circle = pi *r2

= 3.14*2.12*2.12

= 14.112416 m2

Now this will not be our ans

Area = 14.1 m2 ( in most significant way)