Question

a cubical cistern can contains 729 liters find the area of its base.

Answer 1

the volume of cistern is 729.
side³=729
side=√729
side=9
the bottom of the cistern must be a square.
area of base=side*side
=9*9=81 unit square

Answer 2

The area of it's base is 8100 cm².

Given data :

Volume = 729 litres = 729000 cm³

Let, the side = a cm

So,

a³ = 729000

a = 90

So, it's one side = 90 cm

Base area = (90×90) = 8100 cm² (answer)