Question

all edges of a cuboidal box is 12cm?15cm?18cm are to be covered with tape find the minimum length of the tape required

Answer 1

Dear student
$$\begin{gathered} \mathrm{Surface}\mathrm{area}\mathrm{of}\mathrm{cuboidal}\mathrm{box}=2\left(\mathrm{lb}+\mathrm{bh}+\mathrm{bh}\right) \\ =2\left(12\times 15+15\times 18+18\times 12\right) \\ =2\left(180+270+216\right) \\ =2\times 666 \\ =1332{\mathrm{cm}}^2 \\ \mathrm{So}\mathrm{tape}\mathrm{required}\mathrm{to}\mathrm{cover}\mathrm{the}\mathrm{minimum}\mathrm{length}=1332{\mathrm{cm}}^2 \end{gathered}$$
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