transform[p_]:= {p[[1]]+p[[2]]/2, Sqrt[3]/2 p[[2]]};

siszero={5,4,6}; sisone={10,10,10};  (*YOU ENTER THIS AND NOTHING ELSE!*)
firstpoint=siszero/Max[Total[siszero], 0.0001]; secondpoint= sisone/Max[Total[sisone],0.0001];
firstplot={firstpoint[[1]],firstpoint[[2]]}; secondplot={secondpoint[[1]],secondpoint[[2]]};
Show[Graphics[{Line[{{0,0},{1,0},{0,1},{0,0}}],Line[{{1/2,0},{0,1}}], Line[{{0,1/2},{1,0}}], Line[{{0,0},{1/2,1/2}}], 
 {Thick,Red,Line[{firstplot, secondplot}]}
}]]
Show[Graphics[{Line[Map[transform,{{0,0},{1,0},{0,1},{0,0}}]],
Line[Map[transform,{{1/2,0},{0,1}}]], 
Line[Map[transform,{{0,1/2},{1,0}}]], 
Line[Map[transform,{{0,0},{1/2,1/2}}]], {Thick,Red,Line[Map[transform,{firstplot, secondplot}]]}
}]]