Krishna
0

Step 1: Make a not of the given information

Volume of the cube =   64 cm^3

a^3 = 64 cm^3

$a = \sqrt[3]{64}$

a = 4 cm

when you join two cubes of 4cm edge to edge (you can take any edge), one of the dimensions becomes 8 cm

Step 2: Calculating the surface area of the cuboid

Total surface area of a cuboid = 2 (lb+bh+hl)

The length of the resulting cuboid l = side + side = 4 + 4 = 8 cm

Breadth  b =  4cm

Height h = side = 4cm

Total surface area of a cuboid  = 2 [(8)(4) + (4)(4) + (4)(8)]

= 2[32 + 16 + 32]

= 2 [80]

= 160 cm^2