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Question
Find the area of the cardboard required to make a closed box of length 25 cm, 0.5 m and height 15 cm.
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Solution
\[\text { Length of the box }= 25 cm \]
\[\text { Width of the box = 0 . 5 m }\]
\[ = 0 . 5 \times 100 cm ( \because 1 m = 100 cm)\]
\[ = 50 cm \]
\[\text { Height of the box = 15 cm }\]
\[ \therefore \text { Surface area of the box = 2 }\times\text { (length }\times \text { breadth + breadth }\times \text { height + length } \times \text { height)} \]
\[ = 2 \times (25 \times 50 + 50 \times 15 + 25 \times 15)\]
\[ = 2 \times (1250 + 750 + 375)\]
\[ = 4750 {cm}^2\]
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