在四边形ABCD中，AB \perp AD，AB = 6，AD = 8，BC = 24，CD = 26，求四边形ABCD的面积。---**Chart/Diagram Description:** * **Type:** Geometric figure, specifically a quadrilateral. * **Main Elements:** * **Points:** Four vertices labeled A, B, C, and D. * **Lines:** Four line segments connecting the vertices: AB, BC, CD, and DA. * **Relative Position and Direction:** The points appear in order A, B, C, D forming a closed shape. Point A is to the top left. Point B is to the right and slightly above A. Point C is far to the right and lower than B, approximately at the same vertical level as D. Point D is to the bottom left, below A and to the left of C. The line segment CD appears to be nearly horizontal and is the longest side. The figure is a non-convex quadrilateral.