The area of the sheet metal needed to make a box of size 7 cm × 8 cm × 9 cm is:
Answer & explanation
Correct answer: option 1
We know that,
The Total Surface area of the box = 2(lb + bh + lh)
We have,
Length of the box = 7 cm
Breadth of the box = 8 cm
Height of the box = 9 cm
The Total Surface area of the box = 2(7 × 8 + 8 × 9 + 9 × 7) = 2(56 + 72 + 63) = 382 cm2