Question

Two cubes each of side 8cm are joined end to end.Find the surface area of the resulting cuboid.

Answer 1

l=16;b=8;h=8
lbh=8*8*16
=1024

Answer 2

Edge of cube = 8cm
Length of the cuboid after joining = 8+8 =  16cm
Breadth of the cuboid = 8cm
Height of the cuboid = 8cm

Surface area of the cuboid
= 2 (lb+lh+bh)
= 2 (16*8 + 16*8 + 8*8 )
= 2 (128+128+64)
= 2 (320)
= 640 cm²

Therefore, the surface area of the resulting cuboid is 640 cm².