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A^3 = 729
a= root 729
a = 9 cm
TSA of cube = 6a^2
= 6×(9^2)
= 6× 81
; = 486cm^2

volume of the cube = a³

a³ = 729

a = 9

surface area of the cube = 6a²

surface area of the cube = 6 × 9 × 9 =486 sq.cm