Answer:
The height of cube is 3cm.
Explanation:
let length be l.
In cube,
length = height = breadth
Total Surface Area(T.S.A) = 54cm^2
We know that,
T.S.A of cube = 6l^2
or, 54cm^2 = 6l^2
or, (54cm^2)/6 = l^2
or, 9cm^2 = l^2
or, (3cm)^2 = l^2
or, l = 3cm