Question 917347
it's a square, so {{{P=4a}}}


{{{4a=20}}}
{{{4a1=48}}}

{{{a=20/4}}}
{{{a=5}}}

{{{4a1=48}}}
{{{a1=12}}}

{{{a1-a=12-5=7}}}

answer:

B.
	{{{7 }}}inches