As shown in the figure, let the ellipse x2/a2+y2/B2 =1(a >; B>0) The left and right focal points are F 1 and F2, respectively, and the point D is on the ellipse. DF 1 area perpendicular to F 1F2, | f1F2 | | df1| = 2 times the root number 2, and the area of △ Df 1F2 is (root
(1) Find the standard equation of ellipse;
(2) Let the circle with the center on the Y-axis and the ellipse have two intersections above the X-axis, and the two tangents of the circle at these two intersections are perpendicular to each other, and the radius of the circle is calculated through different focal points.