Question

How much cardboard needed to make
a cubical box of 9cm side​

Answer 1

Side of cube = 9cm

We know that,

                         T.S.A. of a cube = 6$l^{2}$

                                                  = 6*9*9

                                                   = 486$cm^{2}$

Hence, 486$cm^{2}$ is needed to make a cube of each edge = 9cm.