A cuboidal box has height, length and width 20 cm, 15 cm and 10 cm respectively. What is its total surface area?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 1300 sq cm
A cuboid has three pairs of identical rectangular faces, so its total surface area is \(2(lb+bh+hl)\).
\(lb=15\times10=150\), \(bh=10\times20=200\), \(hl=20\times15=300\)
Total surface area \(=2(150+200+300)=2\times650=1300\) sq cm
