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

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Solution

Length of each side of the cube = 5 cm

Now, 3 cubes are joined end-to-end.

∴length of cuboid, l = (5 + 5 + 5) cm = 15 cm

breadth of cuboid, b = 5 cm

height of cuboid, h = 5 cm

∴Surface area of the cuboid = 2(lb + bh + hl)

= 2( 15 × 5 + 5 × 5 + 5 × 15 ) cm2

= 350 cm 2

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