Question

Two cubes each of side 15cmare joined end to end. Find the surface area of resulting cuboid.

Answer 1

length of new cuboid is 15+15=30
breadth of cuboid is 15
height of cuboid is 15
total surface area of the new cuboid =2 (lb+ bh+ hl)
=2 (30*15+15*15+15*30)
=2 (450+225+450)
=2*1125
=2250 sq.cm

Answer 2

if we join the cube...
length=30cm
breath =15cm
height=15cm
surface area of cuboid=2(lb×bh×lh)
2(30×15+15×15+30×15)
2250cm^2