Ncert Exercises & Solutions

The length, breadth, and thickness of a rectangular sheet of metal are \(4.234\) m, \(1.005\) m, and \(2.01\) cm respectively. The area and volume of the sheet to correct significant figures are respectively:

1.	\(8.723 \mathrm{~m}^2, 0.0855 \mathrm{~m^3}\)
2.	\(9.1 \mathrm{~m}^2, 0.855 \mathrm{~m^3}\)
3.	\(8.72 \mathrm{~m}^2, 0.085 \mathrm{~m^3}\)
4.	\(8.72 \mathrm{~m}^2, 0.0855 \mathrm{~m^3}\)

Hint: The area and volume must have 3 significant figures in its final value after calculation.

Step 1:

Volume of the sheet:

V = l x b x t

= 4.234 x 1.005 x 0.0201

= 0.08552 m³

Step 2: The volume of the sheet to correct significant figures is given by-

= 0.0855 m³

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