Multiple choice

Three cubes each of side 1 cm are joined end to end, the surface area of the resulting solid is

  1. $7 cm2$
  2. $14 cm2$
  3. $3 cm2$
  4. $8 cm2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When three 1 cm cubes are joined end to end, they form a cuboid of dimensions 3 cm × 1 cm × 1 cm. The surface area of a cuboid is 2(lb + bh + hl) = 2(3×1 + 1×1 + 3×1) = 2(3 + 1 + 3) = 14 cm². This accounts for all 6 faces of the resulting solid.

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