I have defined three regions, Slice1, Slice2 and Slice3.
Slice1 = Polygon[{{0, 0}, {1, 0}, {1, 1/(Sqrt[3])}, {1/2, Sqrt[3]/2}}]; Slice2 = Polygon[{{0, 0}, {-1, 0}, {-1, 1/(Sqrt[3])}, {-1/2, Sqrt[3]/2}}]; Slice3 = Polygon[{{0, 0}, {-1/2, -Sqrt[3]/2}, {0, -2/Sqrt[3]}, {1/2, -Sqrt[3]/2}}]; CombinedSlice = RegionUnion[Slice1, Slice2, Slice3]; RegionPlot[CombinedSlice, AspectRatio -> Automatic] When I RegionPlot the combined plot, Slice3 does not have correct boundaries. The boundary shows up correctly when I plot Slice3 individually.
I am using Mathematica 12.0
