Question 1172524
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Look, there is no way we can possibly help you! Why?

The first figure below is all you have given us. Where in the world is E?  All
you said about E is that it is "outside the parallelogram", which could be like
the other two figures below, or E could even be in New York, California or
Australia. Those places are also "outside the parallelogram"!!!   lol.

{{{drawing(400,400,-40,640,-40,640,

line(87.5,0,587.5,0), line(587.5,0,500,388.8860428),

line(500,388.8860428,0,388.8860428), line(87.5,0,0,388.8860428),

line(87.5,0,300,388.8860428),

locate(87.5,0,G), locate(587.5,0,R), locate(490,420,P), locate(-10,420,C),
locate(290,420,B),

locate(-5,220,350),locate(210,220,400),locate(140,420,300),locate(370,420,200)




 )}}}{{{drawing(400,400,-40,640,-40,640,

line(87.5,0,587.5,0), line(587.5,0,500,388.8860428),

line(500,388.8860428,0,388.8860428), line(87.5,0,0,388.8860428),

line(87.5,0,300,388.8860428),

locate(87.5,0,G), locate(587.5,0,R), locate(490,420,P), locate(-10,420,C),
locate(290,420,B),

locate(-5,220,350),locate(210,220,400),locate(140,420,300),locate(370,420,200),
red(line(300,388.8860428,30,580),line(30,580,500,388.8860428),locate(10,595,E))) )}}}{{{drawing(400,400,-40,640,-40,640,

line(87.5,0,587.5,0), line(587.5,0,500,388.8860428),

line(500,388.8860428,0,388.8860428), line(87.5,0,0,388.8860428),

line(87.5,0,300,388.8860428),

locate(87.5,0,G), locate(587.5,0,R), locate(490,420,P), locate(-10,420,C),
locate(290,420,B),

locate(-5,220,350),locate(210,220,400),locate(140,420,300),locate(370,420,200),
red(line(300,388.8860428,600,580),line(600,580,500,388.8860428),locate(590,605,E))) )}}}

Edwin</pre>