Question : Two cubes each of edge 9 cm are joined to form a single cuboid. What is the total surface area of the cuboid formed?
Option 1: 775 cm2
Option 2: 810 cm2
Option 3: 990 cm2
Option 4: 1024 cm2
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Correct Answer: 810 cm 2
Solution : After joining two cubes, a cuboid is formed. Then, the length of the cuboid, $l$ = 18 cm Breadth of cuboid, $b$ = 9 cm Height of cuboid, $h$ = 9 cm Total surface area = $2(lb + bh + hl)$ = 2(18 × 9 + 9 × 9 + 9 × 18) = 810 cm 2 Hence, the correct answer is 810 cm 2 .
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