Find the total surface area of a cuboid $12$ cm $\times 10$ cm $\times 8$ cm.

Find the total surface area of a cuboid $12$ cm $\times 10$ cm $\times 8$ cm.
  1. $592 \text{ cm}^{2}$
  2. $960 \text{ cm}^{2}$
  3. $296 \text{ cm}^{2}$
  4. $240 \text{ cm}^{2}$

Solution

TSA $= 2(lb+bh+hl) = 2(12\cdot 10 + 10\cdot 8 + 8\cdot 12) = 2(120+80+96) = 2 \times 296 = 592 \text{ cm}^{2}$.

Asked in: IMO

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