Question

An aquarium is in the form of a cuboid whose external measures are $80cm\times 30cm\times 40cm$. The base side faces and back face are to be covered with a coloured paper. Find the area of the paper needed?

Answer 1

Know that an aquarium is in the form of a cuboid whose external measures are $80cm\times 30cm\times 40cm$.

Understand that the surface area of the cuboid is given as $2(lenght\times width)+2(length\times height)+2(height\times width)$.

Therefore, the area of the paper needed:

$\begin{array}{l}(80\times 30)+2(30\times 40)+(80\times 40)\\ =2400+2\times 1200+3200\\ =2400+2400+3200\\ =8000c{m}^2\end{array}$

Hence, the area of the paper needed is $8000c{m}^2$.