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Fill in the blanks to make the statement true.The surface area of a cuboid formed by joining two cubes of side a face to face is __________. |
Answer» 10a2 Explanation: Let “a” be the side of two cubes. When the two cubes are joined face to face, the figure obtained should be a cuboid having the same breadth and height. As the combined cube has a length twice of the length of a cube. It means that l = 2a, b = a and h = a Hence, the total surface area of cuboid = 2(lb + bh + hl) = 2(2a × a + a × a + a × 2a) Simplify the above expression, we get = 2[2a2 + a2 + 2a2] = 10a2 |
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