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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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 =

Vedclass · Accepted Answer

$4.5$

Vedclass · Answer

(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

Similar Questions

The area of a sheet of length $10.2 \,cm$ and width $6.8 \,cm$ expressed up to the proper number of significant figures is ......... $cm^2$.

Write the rules for rounding off numbers.

What are significant figures? What are significant digits? Explain with examples.

The number of significant figures in all the given numbers $25.12, 2009, 4.156$ and $1.217 \times 10^{-4}$ is

For an experimental expression $y=\frac{32.3 \times 1125}{27.4}$,where all the digits are significant. Then to report the value of $y$,we should write $:-$

Vedclass Test Series

Exam Paper Generator

Online Exam Module