Question

Mark the correct alternative in the following question:

The perimeter of a square whose area is 225 m² is

(a) 15 m (b) 60 m (c) 225 m (d) 30 m

Answer 1

$$\begin{gathered} \mathrm{We}\mathrm{have}, \\ \mathrm{Area}\mathrm{of}\mathrm{the}\mathrm{square}=225{\mathrm{m}}^2 \\ \mathrm{As},\mathrm{the}\mathrm{side}\mathrm{of}\mathrm{the}\mathrm{square}=\sqrt{\mathrm{Area}} \\ =\sqrt{225} \\ =15\mathrm{m} \\ \mathrm{So},\mathrm{the}\mathrm{perimeter}\mathrm{of}\mathrm{the}\mathrm{square}=4\times \mathrm{side} \\ =4\times 15 \\ =60\mathrm{m} \end{gathered}$$

Hence, the correct alternative is option (b).