The length and breadth of a rectangular sheet are 16.2 cm and 10.1 cm, respectively. The area of the sheet in appropriate significant figures and error would be, respectively,
1. 164 3
2. 163.62 2.6
3. 163.6 2.6
4. 163.62 3
Hint: The result should have as many significant figures as there are in the value with the least significant figures.
Step 1: Find the area of the sheet.
Given,
Rounding off to three significant digits, area A = 164
Step 2: Find the error.
⇒ΔA=3 cm2 (By rounding off to one significant figure)
Therefore, area, A =A ±ΔA =(164±3) cm2
Hence, option (1) is the correct answer.
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