Question 767877
Let l be the length of rectangular frame
let b  be the breadth of rectangular frame.
= l:b=4:3
=   l=4/3b
As  b=42cm
so, l=4/3*42
    l=56cm
Total frame required will be
     =2(l+b)
     =2(56+42)
     =2(98)
     =196cm