The area of a square is 5.29 . The area of 7 such squares taking into account the significant figures is

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Solution

Q.
The area of a square is 5.29 $c m^{2}$ . The area of 7 such squares taking into account the significant figures is [2019]

1 $37 c m^{2}$

2 $37.0 c m^{2}$

3 $37.03 c m^{2}$

4 $37.030 c m^{2}$

Ans.
(3)

Total Area = $A_{1} + A_{2} + . . . A_{7} = A + A + . . . 7$ times = 37.03 $c m^{2}$ . Addition of 7 terms all having 2 terms beyond decimal, so final answer must have 2 terms beyond decimal (as per rules of significant digits.)

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