讲解这道题---**Extracted Content:** **Question Stem:** 如图，△ABC内接于⊙O,AC=5,BC=12,且∠A=90°+∠B,则点O到AB的距离为( ) **Options:** A. 119/26 B. 60/13 C. 24/5 D. 4 **Chart/Diagram Description:** * **Type:** Geometric figure illustrating a circle with an inscribed triangle and additional related lines. * **Main Elements:** * A circle, labeled with its center O. * An inscribed triangle △ABC, with all its vertices (A, B, C) lying on the circle. * The lengths of two sides of the triangle are given in the problem statement: AC=5, BC=12. * Point H is marked on the chord AB. * A line segment OH is drawn from the center O to point H on chord AB. This segment represents the distance from point O to AB, implying OH is perpendicular to AB. * A line segment CE is drawn as a diameter of the circle, passing through the center O. Points C, O, E are collinear. * Points D and E are on the circle. * Line segments ED and DB are drawn. ED appears to be perpendicular to the diameter CE (as CE is horizontal and ED is vertical). * **Labels and Annotations:** * Points: A, B, C, D, E, H, O. * The labels A, B, C, D, E, H, O are explicitly shown on the diagram. * **Relative Position and Direction:** * O is the center of the circle. * A, B, C, D, E are points on the circumference of the circle. * H is located on the chord AB. * The segment CE passes through O, indicating it is a diameter. * The segment OH is drawn from the center O to the chord AB. * The figure shows C and A generally on the left side, B and D on the right side. CE is depicted as a horizontal diameter, while OH and ED are depicted as vertical segments. * **Coloring:** The circle and the main triangle outlines (AC, BC, AB) are in black. The labels O, C, E, D, B, H, A and the auxiliary line segments CO, OH, CE, ED, DB are in red.