eq1: x^(2) + y^(2) = 100
a = Surface(t, s, (1 / 2 * s) + sqrt(4 - t^(2)), t, -2, 2, s, (-sqrt(4 - t^(2))), sqrt(4 - t^(2)))
A = Point(eq1)
B: (x(A), (-y(A)))
C: (x(A), y(A), y(A))
D: (x(A), (-y(A)), y(A))
m1, b, a_1, c, d = Polygon(B, A, C, D)