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प्रश्न
Find the surface area of a cube whose edge is 2.1 m.
उत्तर
\[\text { Edge of the a cube = 2 . 1 m } \]
\[ \therefore\text { Surface area of the cube = 6 } \times \text { (side )}^2 = 6 \times (2 . 1 )^2 = 6 \times 4 . 41 = 26 . 46 m^2\]
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