Question 274776
Plot the 1st point A(-3,2)

{{{drawing( 700, 700, -10, 10, -10, 10,
  grid( 1 ),circle(-3,2,0.05),
  circle(-3,2,0.08),circle(-3,2,0.10),circle(-3,2,0.12),
  locate(-3,2.8,A)
  )}}}


Plot the 2nd point B(9,2)

{{{drawing( 700, 700, -10, 10, -10, 10,
  grid( 1 ),circle(-3,2,0.05),
  circle(-3,2,0.08),circle(-3,2,0.10),circle(-3,2,0.12),circle(9,2,0.05),
  circle(9,2,0.08),circle(9,2,0.10),circle(9,2,0.12),
  locate(-3,2.8,A),locate(9,2.8,B)  
  )}}}


Plot the 3rd point C(3,-6)

{{{drawing( 700, 700, -10, 10, -10, 10,
  grid( 1 ),circle(-3,2,0.05),
  circle(-3,2,0.08),circle(-3,2,0.10),circle(-3,2,0.12),circle(9,2,0.05),
  circle(9,2,0.08),circle(9,2,0.10),circle(9,2,0.12),circle(3,-6,0.05),
  circle(3,-6,0.08),circle(3,-6,0.10),circle(3,-6,0.12),
  locate(-3,2.8,A),locate(9,2.8,B), locate(3,-5.2,C)
  )}}}



Now connect the points to plot the triangle:



{{{drawing( 700, 700, -10, 10, -10, 10,
  grid( 1 ),circle(-3,2,0.05),
  circle(-3,2,0.08),circle(-3,2,0.10),circle(-3,2,0.12),circle(9,2,0.05),
  circle(9,2,0.08),circle(9,2,0.10),circle(9,2,0.12),circle(3,-6,0.05),
  circle(3,-6,0.08),circle(3,-6,0.10),circle(3,-6,0.12),
  locate(-3,2.8,A),locate(9,2.8,B), locate(3,-5.2,C),
  line(-3,2,9,2),line(9,2,3,-6),line(3,-6,-3,2)
  )}}}