Question

write the formula for surface area of cube with one side open. (Side =a)​

Answer 1

Surface area of cube= tsa of cube - a2

                                   = 6a2-a2

                                   = 5a2

Answer 2

S = a

S. A. of cube with one side open = 6 (s×s) - (s×s)

S. A. of cube with one side open = 6 (s×s) - (s×s) = 5 (s×s)

S. A. of cube with one side open = 6 (s×s) - (s×s) = 5 (s×s) = 5 (a×a) [ s=a]

= 5a square