Two cubes each of edge 9 cm are joined to form a single cuboid. What is the total surface area of the cuboid formed?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 810 cm2.
Total surface area of the cuboid = 2(LB + BH + HL)
Where, L = Length, B = Breadth and H = Height
When two cubes are combined to form a cuboid,
Length = 18 cm, Breadth = 9 cm and Height = 9 cm
Total surface area = 2(18 × 9 + 9 × 9 + 9 × 18)
⇒ 2 × 405 = 810 cm2