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प्रश्न
Find the surface area of a cuboid whoselength = 3.2 m, breadth = 30 dm, height = 250 cm.
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उत्तर
\[\text { Dimensions of the cuboid: } \]
\[\text { Length = 3 . 2m }\]
\[ = 3 . 2 \times 10 dm (1 m = 10 dm)\]
\[ = 32 dm\]
\[\text { Breadth = 30 dm } \]
\[\text { Height = 250 cm }\]
\[ = 250 \times \frac{1}{10}dm (10cm = 1 dm)\]
\[ = 25 dm\]
\[\text { Surface area of the cuboid = 2 } \times (\text { length } \times \text { breadth + breadth}\times \text { height + length } \times\text { height })\]
\[ = 2 \times (32 \times 30 + 30 \times 25 + 32 \times 25)\]
\[ = 2 \times (960 + 750 + 800)\]
\[ = 5020 {dm}^2\]
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