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Question
A cuboidal box is 5 cm by 5 cm by 4 cm. Find its surface area.
Solution
\[\text { The dimensions of the cuboidal box are 5 cm }\times 5 cm \times 4 cm . \]
\[\text { Surface area of the cuboidal box = 2 } \times (\text { length } \times \text { breadth + breadth } \times \text { height + length }\times \text { height })\]
\[ = 2 \times (5 \times 5 + 5 \times 4 + 5 \times 4)\]
\[ = 2 \times (25 + 20 + 20)\]
\[ = 130 {cm}^2\]
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