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Units and Measurement
Question
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The radius of the circle is r = 1.72 cm. In how many significant figures will you express the area of circle? (Area of circle is ?r2.)

Answer

Given, radius of the circle, r = 1.72 cm
The number of significant figures is 3 here. . 

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Some More Questions From Units and Measurement Chapter

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?

How many fundamental quantities are there in mechanics?