Question 813875
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
( 4, 1)
(-6, 7)  D = {{{sqrt ((x[1]-x[2])^2+(y[1]-y[2])^2))}}}
         D = {{{sqrt(10^2 + (-6)^2) = sqrt(136) = sqrt(4*34) = 2sqrt(34)}}}