Question

plz answer with working

Answer 1

Cuboid
I=a
B=b
H=c
Volume of cuboid =lxbxh
Surface area of cuboid =2(lb+bh+lh)
=2(ab+bc+ca)
Both sides divided by abc
S/v=2(ab/abc+bc/abc+ca/abc)
S/v=2(1/a+1/b+1/c)
1/v=2/s(1/a+1/b+1/c) proved