Question 980247
<pre>Get some graph paper. 

{{{drawing(700,2800/9,-21,15,-4,12, grid(1),

circle(-10,-2,0.15),circle(-10,-2,0.13),circle(-10,-2,0.11),circle(-10,-2,0.09),circle(-10,-2,0.07),circle(-10,-2,0.05),circle(-10,-2,0.03),circle(-10,-2,0.01),

circle(-3,4,0.15),circle(-3,4,0.13),circle(-3,4,0.11),circle(-3,4,0.09),circle(-3,4,0.07),circle(-3,4,0.05),circle(-3,4,0.03),circle(-3,4,0.01),

circle(6,4,0.15),circle(6,4,0.13),circle(6,4,0.11),circle(6,4,0.09),circle(6,4,0.07),circle(6,4,0.05),circle(6,4,0.03),circle(6,4,0.01),

circle(-1,-2,0.15),circle(-1,-2,0.13),circle(-1,-2,0.11),circle(-1,-2,0.09),circle(-1,-2,0.07),circle(-1,-2,0.05),circle(-1,-2,0.03),circle(-1,-2,0.01),

circle(-19,-2,0.15),circle(-19,-2,0.13),circle(-19,-2,0.11),circle(-19,-2,0.09),circle(-19,-2,0.07),circle(-19,-2,0.05),circle(-19,-2,0.03),circle(-19,-2,0.01),

circle(13,10,0.15),circle(13,10,0.13),circle(13,10,0.11),circle(13,10,0.09),circle(13,10,0.07),circle(13,10,0.05),circle(13,10,0.03),circle(13,10,0.01),

red(line(-10,-2,-1,-2),line(-1,-2,6,4),line(6,4,-3,4),line(-3,4,-10,-2)))}}}

Notice that to go from (6,4) to (-3,4) you go 9 units left.
Therefore you go 9 units left from (-10,-2) and end up at (-19,-2)



{{{drawing(700,2800/9,-21,15,-4,12, grid(1),

circle(-10,-2,0.15),circle(-10,-2,0.13),circle(-10,-2,0.11),circle(-10,-2,0.09),circle(-10,-2,0.07),circle(-10,-2,0.05),circle(-10,-2,0.03),circle(-10,-2,0.01),

circle(-3,4,0.15),circle(-3,4,0.13),circle(-3,4,0.11),circle(-3,4,0.09),circle(-3,4,0.07),circle(-3,4,0.05),circle(-3,4,0.03),circle(-3,4,0.01),

circle(6,4,0.15),circle(6,4,0.13),circle(6,4,0.11),circle(6,4,0.09),circle(6,4,0.07),circle(6,4,0.05),circle(6,4,0.03),circle(6,4,0.01),

circle(-1,-2,0.15),circle(-1,-2,0.13),circle(-1,-2,0.11),circle(-1,-2,0.09),circle(-1,-2,0.07),circle(-1,-2,0.05),circle(-1,-2,0.03),circle(-1,-2,0.01),

circle(-19,-2,0.15),circle(-19,-2,0.13),circle(-19,-2,0.11),circle(-19,-2,0.09),circle(-19,-2,0.07),circle(-19,-2,0.05),circle(-19,-2,0.03),circle(-19,-2,0.01),

circle(13,10,0.15),circle(13,10,0.13),circle(13,10,0.11),circle(13,10,0.09),circle(13,10,0.07),circle(13,10,0.05),circle(13,10,0.03),circle(13,10,0.01),

red(line(-19,-2,-10,-2),line(-10,-2,6,4),line(6,4,-3,4),line(-3,4,-19,-2)))}}}

From (-10,-2) to (-3,4) you have to go right 7 units and up 6. So you start at
(6,4) and do the same -- go right 7 and up 6, and you end up at (13,10)


{{{drawing(700,2800/9,-21,15,-4,12, grid(1),

circle(-10,-2,0.15),circle(-10,-2,0.13),circle(-10,-2,0.11),circle(-10,-2,0.09),circle(-10,-2,0.07),circle(-10,-2,0.05),circle(-10,-2,0.03),circle(-10,-2,0.01),

circle(-3,4,0.15),circle(-3,4,0.13),circle(-3,4,0.11),circle(-3,4,0.09),circle(-3,4,0.07),circle(-3,4,0.05),circle(-3,4,0.03),circle(-3,4,0.01),

circle(6,4,0.15),circle(6,4,0.13),circle(6,4,0.11),circle(6,4,0.09),circle(6,4,0.07),circle(6,4,0.05),circle(6,4,0.03),circle(6,4,0.01),

circle(-1,-2,0.15),circle(-1,-2,0.13),circle(-1,-2,0.11),circle(-1,-2,0.09),circle(-1,-2,0.07),circle(-1,-2,0.05),circle(-1,-2,0.03),circle(-1,-2,0.01),

circle(-19,-2,0.15),circle(-19,-2,0.13),circle(-19,-2,0.11),circle(-19,-2,0.09),circle(-19,-2,0.07),circle(-19,-2,0.05),circle(-19,-2,0.03),circle(-19,-2,0.01),

circle(13,10,0.15),circle(13,10,0.13),circle(13,10,0.11),circle(13,10,0.09),circle(13,10,0.07),circle(13,10,0.05),circle(13,10,0.03),circle(13,10,0.01),

red(line(-10,-2,6,4),line(6,4,13,10),line(13,10,-3,4),line(-3,4,-10,-2)))}}}

If you put all those together on one graph, you have a triangle with the midpoints of the sides connected.

{{{drawing(700,2800/9,-21,15,-4,12, grid(1),

circle(-10,-2,0.15),circle(-10,-2,0.13),circle(-10,-2,0.11),circle(-10,-2,0.09),circle(-10,-2,0.07),circle(-10,-2,0.05),circle(-10,-2,0.03),circle(-10,-2,0.01),

circle(-3,4,0.15),circle(-3,4,0.13),circle(-3,4,0.11),circle(-3,4,0.09),circle(-3,4,0.07),circle(-3,4,0.05),circle(-3,4,0.03),circle(-3,4,0.01),

circle(6,4,0.15),circle(6,4,0.13),circle(6,4,0.11),circle(6,4,0.09),circle(6,4,0.07),circle(6,4,0.05),circle(6,4,0.03),circle(6,4,0.01),

circle(-1,-2,0.15),circle(-1,-2,0.13),circle(-1,-2,0.11),circle(-1,-2,0.09),circle(-1,-2,0.07),circle(-1,-2,0.05),circle(-1,-2,0.03),circle(-1,-2,0.01),

circle(-19,-2,0.15),circle(-19,-2,0.13),circle(-19,-2,0.11),circle(-19,-2,0.09),circle(-19,-2,0.07),circle(-19,-2,0.05),circle(-19,-2,0.03),circle(-19,-2,0.01),

circle(13,10,0.15),circle(13,10,0.13),circle(13,10,0.11),circle(13,10,0.09),circle(13,10,0.07),circle(13,10,0.05),circle(13,10,0.03),circle(13,10,0.01),

red(line(-19,-2,-10,-2),line(-10,-2,6,4),line(6,4,-3,4),line(-3,4,-19,-2)),
red(line(-10,-2,6,4),line(6,4,13,10),line(13,10,-3,4),line(-3,4,-10,-2)),
red(line(-10,-2,6,4),line(6,4,13,10),line(13,10,-3,4),line(-3,4,-10,-2)),
red(line(-10,-2,-1,-2),line(-1,-2,6,4),line(6,4,-3,4),line(-3,4,-10,-2)),
red(line(-10,-2,6,4),line(6,4,13,10),line(13,10,-3,4),line(-3,4,-10,-2)))}}}

Edwin</pre>