question_answer

The lid of a rectangular box of sides 40 cm by 10 cm is sealed all round with tape. What is the length of the tape required?

Answer:

Length of the tape required = Perimeter of the lid of a rectangular box \[=2\times (length\times breadth)\]                                                                                                            \[=2\times (40\,\,cm+10\,\,cm)\] \[=2\times 50\text{ }cm\] \[=100\text{ }cm\text{ }or\text{ }1m\]