6. Three cubes, each having an edge of 3 cm, are joined together. Find the surface area of the cuboid
thus formed. Is this surface area equal to the surface areas of the three separate cubes?
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Answer:
When 3 cubes of edge 3cm each are joined, a cuboid is formed.
Now, length of cuboid = (3+3+3) cm
=9cm
Breadth of cuboid = 3cm
Height of cuboid =3cm
Surface area of cuboid =2(lb+bh+hl)
=2(9×3+3×3+3×9)
=2(27+9+27)
=2×63
=126cm²
Surface area of cube=6×3²=54cm²
Thus, area of cuboid is not equal to area of separate cubes.
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