Answer :
2(h × W) + 2(h × L) + 2(W × L)
2(4.2•3.1)=26.04
2(4.2•7.5)=63
2(3.1•7.5)=46.5
26.04+63+46.5=135.54 in
2(4.2•3.1)=26.04
2(4.2•7.5)=63
2(3.1•7.5)=46.5
26.04+63+46.5=135.54 in