Question

If two cubes each of side $10\mathrm{cm}$ are joined to form a cuboid then the total surface of cuboid is___

Answer 1

Answer: 1000

Side of cube $=10\mathrm{cm}$
Two cubes are joined to form a cuboid
$\therefore$ Length of cuboid $=10+10=20\mathrm{cm}$
Breadth of cuboid $b=10\mathrm{cm}$
Height of cuboid $\mathrm{h}=10\mathrm{cm}$
$\therefore$ Total surface area of cuboid $=2(lb+bh+hl)$
$=2(20\times 10+10\times 10+10\times 20)$
$=2(200+100+200)$
$=1000{\mathrm{cm}}^2$