from math import*
from matplotlib.pyplot import *

def coord (LA,LB):
  xA=LA[0] ; xB=LB[0]
  yA=LA[1] ; yB=LB[1]
  mx=...................
  my=...................
  L=[mx,my]
  return(L)

def repere(LA,LB):
  Lx=[LA[0],LB[0]]
  Ly=[LA[1],LB[1]]
  L=coord(LA,LB)
  Lx.append(L[0])
  Ly.append(L[1])
  plot(Lx,Ly,'ro')
  show()
  return()