Sarthaks Test
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The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. Give the area and volume of the sheet to correct significant figures.

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Length of sheet, l = 4.234 m 

Breadth of sheet, b = 1.005 m 

Thickness of sheet, h = 2.01 cm = 0.0201 m 

The given table lists the respective significant figures:

QuantityNumberSignificant Figure
l4.2344
b1.0054
h2.013

Hence, area and volume both must have least significant figures i.e., 3.

Surface area of the sheet = 2 (l × b + b × h + h × l)

= 2(4.234 × 1.005 + 1.005 × 0.0201 + 0.0201 × 4.234)

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