Question 926884
 
plot points:

{{{drawing( 600, 600, -10, 10, -10, 10,grid(1),line(-3,4,1,5), line(1,5,2,1),
   line(2,1,-2,0), line(-2,0,-3,4),circle(2,1,.12),circle(1,5,.12),circle(-3,4,.12),circle(-2,0,.12), graph( 600, 600, -10, 10, -10, 10, 0)) }}} 

find the distance:

*[invoke distance_formula -2, 0, -3, 4]


*[invoke distance_formula 1, 5, -3, 4]


*[invoke distance_formula 1, 5, 2, 1]

*[invoke distance_formula -2, 0, 2, 1]

since all same, means you have a square;

so, the perimeter will be {{{P=4d=4(4.123)=16.492}}}

 and area {{{A=d^2=(4.123)^2=16.999}}}