Generally speaking, triangular land is bad feng shui, that is to say, houses are built on triangular terrain. In this case, there will generally be a road rush or scissors difference, which is not good for the house itself.
But in your case, a piece of land behind the house is triangular, which means there is no problem in front of the house. If the triangular land behind it does not form a scissors-shaped intersection, there is no problem.