%%HP: T(1)A(D)F(.);
 { {
"DEMOSTRAR QUE LOS CUATRO PTOS"
"(2,4).(7,3),(6,-2)Y(1,-1) SON"
"VERTICES DE UN CUADRADO Y QUE"
"SUS DIAGONALES SON PERPENDICU-"
"LARES Y SE DIVIDEN MUTUAMENTE"
"EN PARTES IGUALES."
"MAB=3-4/7-2=-1/5"
"MBC=-2-3/6-7=-5/-1=5"
"MCD=-1-(-2)/1-6=1/-5=-1/5"
"MDA=4-(-1)/2-1=5/1=5"
} {
"MD1=-2-4/6-2=-6/4=-3/2"
"MD2=3-(-1)/7-1=4/6=2/3"
"PMD1=((2+6)/2 , (4+(-2)/2))  "
"    =(4,1)"
"PMD2=((7+1)/2 , (3+(-1)/2))"
"    = (4,1) " ""
"" "" "" } } HELP.3

