Question 946630
Her guess is wrong, you did it correct. 

the length of a ribbon around the sides of a picture frame,if the frame is {{{L=11in}}}  long and {{{W=7in}}} wide, will be equal to the perimeter

the perimeter is the sum of all four sides where two sides are the length and two sides are the width

so, the perimeter {{{P}}} is:

{{{P=2L+2W}}}

{{{P=2*11in+2*7in}}}

{{{P=22in+14in}}}

{{{P=36in}}}

so, you will need {{{36in}}} ribbon