Question

If two cubes each of side 12 cm are joined end to end,then the surface area of the resulting cuboid is what?

Answer 1

The surface area of cube =6a^2
=6X(12)^2
=6X144
=864

The surface area of two cubes are=864X2
=1728

Then they are making cuboid mean the inner side of cubes should be forgotten then the area of a side is =144
Therefore,there are two sides mean =144X2
=288

The surface area of cuboid is =1728-288
=1440