lc = 1.0;

a = 10;
b = 20;

px = a * Cos(Pi * 0.25);
py = b * Sin(Pi * 0.25);

Point(1) = {  0,  0, 0, lc};
Point(2) = {  0,  b, 0, lc};
Point(3) = { px, py, 0, lc};
Point(4) = {-px, py, 0, lc};

Line(1) = {3, 4};
Ellipse(2) = {4, 1, 2, 3};

Line Loop(3) = {1, 2};
Plane Surface(4) = {3};

Physical Surface("Test") = {4};
