Question

Find the area of the cardboard required to make a closed box of length 25 cm, 0.5 m and height 15 cm.

Answer 1

$$\begin{gathered} \mathrm{Length}\mathrm{of}\mathrm{the}\mathrm{box}=25\mathrm{cm} \\ \mathrm{Width}\mathrm{of}\mathrm{the}\mathrm{box}=0.5\mathrm{m} \\ =0.5\times 100\mathrm{cm}(\because 1\mathrm{m}=100\mathrm{cm}) \\ =50\mathrm{cm} \\ \mathrm{Height}\mathrm{of}\mathrm{the}\mathrm{box}=15\mathrm{cm} \\ \therefore \mathrm{Surface}\mathrm{are}a\mathrm{of}\mathrm{the}\mathrm{box}=2\times (\mathrm{length}\times \mathrm{breadth}+\mathrm{breadth}\times \mathrm{height}+\mathrm{length}\times \mathrm{height}) \\ =2\times (25\times 50+50\times 15+25\times 15) \\ =2\times (1250+750+375) \\ =4750{\mathrm{cm}}^2 \end{gathered}$$