Three cubes each side 5 cm are joined end to end.Find the surface area of resulting cuboid.

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Solution

Length of each side of the cube = 5 cm
Now, 3 cubes are joined end-to-end.
âˆ´length of cuboid, l = (5 + 5 + 5) cm = 15 cm
breadth of cuboid, b = 5 cm
height of cuboid, h = 5 cm
âˆ´Surface area of the cuboid = 2(lb + bh + hl)
= 2( 15 Ã— 5 + 5 Ã— 5 + 5 Ã— 15 ) cm²
= 350 cm²

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