Question

4. Two cubes each of volume 64 cm
joined end to end together. Find
surface area of the resulting cuboid
​

Answer 1

Volume of each cube = 64 cm³

side³ = 64

side³ = 4³

Hence, side = 4 cm

Now if two cubes are joined together it will form a cuboid.

Length of the resisting cuboid,

l = 2 × side cm

l = 2 × 4

l = 8 cm

Breadth, b = 4cm

Height, h = 4cm

Hence surface Area

SA = 2 ( lb + bh + hl )

SA = 2 ( 8×4 + 4×4 + 4×8 )

SA = 2 ( 32 + 16 + 32 )

SA = 2 ( 64 + 16 )

SA = 2 × 80

SA = 160 cm²

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Answer 2

Volume of each cube = 64 cm3

side3 =64

side3 = 4