Question 1104880
The line between ( 5,9 ) and ( 5,3 ) is a vertical line
from {{{ y = 3 }}} to {{{ y = 9 }}} the length is
{{{ 9 - 3 = 6 }}}
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The line between ( 3,9 ) and ( 3,3 ) is also vertical
from {{{ y = 3 }}} to {{{ y = 9 }}} the length is
{{{ 9 - 3 = 6 }}}
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The line between ( 5,9 ) and ( 3,9 ) is a horizontal line
from {{{ x = 3 }}} to {{{ x = 5 }}} the length is
{{{ 5 - 3 = 2 }}}
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The line between ( 3,3 ) and ( 5,3 ) is also horizontal
from {{{ x = 3 }}} to {{{ x = 5 }}} the length is
{{{ 5 - 3 = 2 }}}
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The length of the border is {{{ 6 + 6 + 2 + 2 = 16 }}}