Question

The area of a square is $5.29{\text{cm}}^2.$ The area of $7$ such squares taking into account the significant figures is-

• A. $37.03{\text{cm}}^2$
• B. $37.0{\text{cm}}^2$
• C. $37.030{\text{cm}}^2$
• D. $37{\text{cm}}^2$

Answer 1

The correct option is B $37.0{\text{cm}}^2$

$A=7\times 5.29=37.03{\text{cm}}^2$
The result should have three significant figures.

$\therefore A=37.0{\text{cm}}^2$
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(D\right)$ is the correct answer.