Question 864715
<pre><font face = "consolas" color = "indigo" size = 3><b>
Hi
(6,1) 
(2,-3)  m = 4/4 = 1   D = sqrt(32), D^2 = 32
(4,-5)  m = 2/-2 = -1  Lines perpendicular, right angle, d = sqrt(8), D^2 = 8
(6,1)  D = sqrt(36 + 4) = sqrt(40), D^2 = 40
   32 + 8 = 40
{{{drawing(300,300,   -6, 6, -6, 6, grid(1), 
circle(6, 1,0.2),
circle(2, -3,0.2),
line(6,1,2,-3),
circle(4, -5,0.2),
line(2,-3,4,-5),
green(line(6,1,4,-5)),
graph( 300, 300, -6, 6, -6, 6) )}}}