The radius of a disc is 1.2 ; cm. Its area ac | vedclass

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(D) The formula for the area of a disc is $A = \pi R^2$.Given the radius $R = 1.2 \; cm$,which has $2$ significant figures.Calculating the area: $A =

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$4.5$

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(D) The formula for the area of a disc is $A = \pi R^2$.Given the radius $R = 1.2 \; cm$,which has $2$ significant figures.Calculating the area: $A = 3.14159 	imes (1.2)^2 = 3.14159 	imes 1.44 = 4.52388... \; cm^2$.According to the rules of significant figures,the result of a multiplication should have the same number of significant figures as the measurement with the least number of significant figures.Since $1.2$ has $2$ significant figures,the final result must be rounded to $2$ significant figures.Rounding $4.52388...$ to $2$ significant figures gives $4.5 \; cm^2$.

The radius of a disc is $1.2 \; cm$. Its area according to the concept of significant figures will be given by

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