Question

The total surface area of a cuboid of length 'l', breadth 'b' and height 'h' in square units is

• A. lbh
• B. 2h(l + b)
• C. 2(1b + bh + lh)
• D. 2(l + b)

Answer 1

The Correct Option is C

Correct answer: 2(lb + bh + lh)

Explanation: 
The total surface area (TSA) of a cuboid is the sum of the areas of all six rectangular faces. 
A cuboid has:

• 2 faces of size $l \times b$
• 2 faces of size $b \times h$
• 2 faces of size $l \times h$

So, the total surface area is: $$2(lb + bh + lh)$$

Hence, the total surface area is 2(lb + bh + lh).