Question

An aquarium is in the form of a cuboid whose external measures are $50cm\times 40cm\times 30cm$. The base, side faces and back face are to be covered with a colored paper. Find the area of the paper needed? [ 3 MARKS ]

Answer 1

Formula: 1.5 Marks
Solution: 1.5 Marks

The length of the aquarium = l = 50 cm

Width of the aquarium = b = 40 cm

Height of the aquarium = h = 30 cm

Area of the base
$=l\times b=50\times 40=2000c{m}^2$

Area of the side face
$=b\times h=40\times 30=1200c{m}^2$

Area of the back face
$=l\times h=50\times 30=1500c{m}^2$

Required area = Area of the base + area of the back face + $(2\times areaofasideface)$

$=2000+1500+(2\times 1200)=5900c{m}^2$

Hence the area of the coloured paper required is $5900c{m}^2$.