A closed box is in the shape of a cuboid of length 12 cm, breadth 8 cm and height 5 cm. What is its total surface area?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 392 cm2
A cuboid has three pairs of equal faces, so its total surface area is \(2(lb+bh+lh)\).
\(lb=12\times8=96\), \(bh=8\times5=40\), \(lh=12\times5=60\)
\(lb+bh+lh=96+40+60=196\)
Total surface area \(=2\times196=392\) cm2
