25. (The full score of this small question is 14) as shown in figure 13. The image of the quadratic function intersects with the X axis at points A and B, and intersects with the Y axis at point C (0,-1). The area of Δ Δ ABC is. (1) Find the relation of quadratic function; (2) Take a point M(0, m) on the Y axis as the vertical line of the Y axis in the morning. If the vertical line of ABC has a common point with the circumscribed circle, find the range of m; (3) Is there a point D on the image of quadratic function, which makes the quadrilateral ABCD a right trapezoid? If it exists, find the coordinates of point D; If it does not exist, please explain why.