Question

find the volume of a cube one face of which has an area of 81 m^2

Answer 1

Hi there !!

Given,

Area of One of the face of cube = 81m²

Let each edge be x
Area of one face = l²
81 = l²
l = ✓81
l = 9m

Each edge = 9m

Volume of cube = side³ = (9m)³ = 729cm³

Thus,
the volume is 729cm³

Answer 2

Heya!

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Area of one face of cube = 81 m^2
Edge of one edge of cube = ?

Area of a square = side^2
Let the side be x

81 = x^2
x= √81
x= 9 m

Volume of cube = Side^3
Volume = 9×9×9
Volume = 729 m^2
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Hope it helps...!!!