In quadrilateral A B C D, \angle B is a right angle, diagonal \overline{A C} is perpendicular to \overline{C D}, A B=18, B C=21, and C D=14. Find the perimeter of A B C D.
In quadrilateral A B C D, \angle B is a right angle, diagonal \overline{A C} is perpendicular to \overline{C D}, A B=18, B C=21, and C D=14. Find the perimeter of A B C D.