TopoDS_Shape shape;
BRep_Builder builder;
std::ifstream f("C:\\path\\to\\file.brep");
BRepTools::Read(shape, f, builder);

for (TopExp_Explorer fExp(shape, TopAbs_FACE); fExp.More(); fExp.Next())
{
	TopoDS_Face face = TopoDS::Face(fExp.Current());

	gp_Vec dir(0, -1, -0);
	gp_Pnt cylLocOnPlane(800, 625, 183);
	gp_Ax2 xdir(cylLocOnPlane, dir.Reversed());
	double multiplier = 0.75000000000002087;

	gp_GTrsf x_aff;
	x_aff.SetAffinity(xdir, multiplier);

	BRepBuilderAPI_GTransform aBRepGTrsf(face, x_aff);
	auto result = TopoDS::Face(aBRepGTrsf.Shape());
}