Question

two cubes with 12 cm edge are joined end to end. find the surface area of the resulting cuboid.

Answer 1

if two cubes are joined together it will become dubious sub in formula lbh ...l=24...b12...h12

Answer 2

Two cubes of each side = 12cm

Joined end to end
length = 12+12 = 24cm
height = 12cm
breadth = 12cm

Total surface area of new cuboid formed
=2(lb+bh+hl)
=2(24*12+12*12+12*24)
=2(288+144+288)
=2(720)
=2*720
=1440

Hence, total surface area of new cuboid formed = 1440cm sq.