Question 453182
length = {{{sqrt((x2 -x1)^2 + (y2 - y1)^2)}}}

length = {{{sqrt((4 + 7)^2 + (1 - 3 )^2)}}}

length = {{{sqrt(125)}}}

length = 5{{{sqrt(5)}}} 


midpoint = ((-7 + 3) /2) ,  ( 3 + 1 ) / 2))  = (-2, 2 )


Cleomenius.