Question

Total surface area of a cuboid open at the top having length 2 cm, breadth 3 cm and height 4 cm is .

• A. $46c{m}^2$
• B. $48c{m}^2$
• C. $52c{m}^2$

Answer 1

The correct option is A $46c{m}^2$

TSA of a cuboid = $2(lb+bh+lh)$, where $l,bandh$ are length, breadth and height of a cuboid respectively.
As the cuboid is open at the top. So, we have to subtract the top face area from TSA .
$\therefore$ TSA of cuboid open at the top
= $2(lb+bh+lh)-lb$
=$2\left[\right(2\times 3)+(3\times 4)$+$(2\times 4)]-2\times 3$
= $46c{m}^2$