Question

Two cubes each of 10 cm edge are joined end to end find the surface area of the resulting cuboid

Answer 1

In cubes,

length = 10 cm

breadth = 10 cm

height = 10 cm

In cuboid,

length = 10 + 10 = 20 cm

breadth = 10 cm

height = 10 cm

∴ Surface area = 2(l+b)h

                          =2(20+10)10

                          =2 * 30 * 10

                          =600 cm²

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Answer 2

in the resulting cuboid ,

length will be 20 cm

and breadth will remain 10 cm

also height will be 10 cm

so the solution is in attachment

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