4. Two cubes each of volume 64 cm are joined end to end together. Find the surface areaof the resulting cuboid.
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Answer:
The volume of cube 64cm ^3
Side of cube 3 64 =4cm
Length of resulting cuboid 4+4=8
Surface area
=2(lb+hl+bh)
=2(4(4)+4(8)+8(4))
=2(16+32+32)
=2(80)=160cm ^2
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