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
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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