Five cubes, each of edge 3 cm, are joined end to end to form a cuboid. What is the total surface area of this cuboid?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 198 cm2
Placed in a row, the five cubes make one cuboid whose length is five edges while its breadth and height stay one edge each. Its total surface area is \(2(lb+bh+hl)\).
Length \(=5\times3=15\) cm, breadth \(=3\) cm, height \(=3\) cm
\(lb+bh+hl=15\times3+3\times3+3\times15=45+9+45=99\)
Total surface area \(=2\times99=198\) cm2
