Three cubes each of sides 7 cm are joined end to end. Find the surface area of the resulting solid.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 686 cm2
| Undderstanding/Application |
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When the three cubes are joined, a cuboid will be formed of length = 21 cm, b = 7 cm and h = 7 cm |
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TSA = 2(lb + bh + hl) = 2[(21 × 7) + (7 × 7) + (7 × 21)] = 2[147 + 49 + 147] = 2(343) = 686 cm2 |