Reflection in rectangle

There are two rectangles whose horizontal length is 40 cm.

As shown in Fig. 1, a straight line is drawn toward B from A.

A straight line is drawn for the angle of ① and ②, and the angle of ③ and ④ to become equal, respectively.

Answer

(1) In the first rectangle, when writing as ABCDE, E overlapped with A. Find the vertical length of this rectangle.

(2) In the 2nd rectangle, as shown in Fig. 2, when writing as ABCDEFGHl, the lenghth of A and I was 12 cm. Find the vertical length of this rectangle.