Question

two cubes each of volume 512 cm sq. are joined end to end.Find the surface area of resulting cuboid?
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Answer 1

Answer:

1536 cm sq

Step-by-step explanation:

Vol of cube = s³

.°. s = ³√512

= 8 cm

If they are joined end to end , s = 8+8

= 16 cm

Now the Surface area = 6s²

= 6 x 16²

= 1536 cm sq

And in your question it should be 512 cm ³, not 512 cm sq .

Answer 2

Step-by-step explanation:

Volume of cube=a^3

512=a^3,

a=8cm.

Now,when both cubes will kept together it will form a cuboid of length=16 cm and

breadth=8 cm.

hence, it total surface area=2(lb+bh+hl)

=2(16*8+16*8+16*8)

=768cm^2