Question

If two cubes each of side 12 cm are joined end to end then the surface area of the resulting cuboid is

• A. 1728 $c{m}^2$
• B. 1440 $c{m}^2$
• C. 1445 $c{m}^2$
• D. 1450 $c{m}^2$

Answer 1

The correct option is B 1440 $c{m}^2$

Given the side of cube is 12 cm

Then if two cubes are joined Then the length of cuboid =12+12=24 cm, breadth is 12 cm and height is 12 cm

Then surface area of cuboid =$2(24\times 12+\times 12\times 12+\times 24\times 12)=2(288+144+288)=2\times 720=1440c{m}^2$