Question 471116
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
Plotting A(1,2), B (1,0) and C(4,0), fourth vertex would be D(4,2)
{{{drawing(300,300,   -6, 6, -6, 6,  grid(1),
circle(1, 2,0.3),
locate(.5,2.5,"A"),
circle(1, 0,0.3),
locate(.5,-.5,"B"),
circle(4, 0,0.3),
locate(4.5,-.5,"C"),
circle(4, 2,0.3),
locate(4.5,2.5,"D"),

graph( 300, 300, -6, 6, -6, 6))}}}