If the edge of a cube is doubled, its total surface area becomes:

If the edge of a cube is doubled, its total surface area becomes:
  1. Twice
  2. Four times
  3. Eight times
  4. Same

Solution

TSA $= 6 a^{2}$. New TSA $= 6 (2a)^{2} = 24 a^{2}$, which is $4$ times the original.

Asked in: IMO

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