For example, all internal angles of pentagonal ABCDE are equal, ∠ 1=∠2, ∠3=∠4, then AE is parallel to BD?
Parallelism Because the sum of the internal angles of the Pentagon is 540 degrees, each internal angle is 540 degrees /5= 108 degrees, and the other day is 1= 2, 3= 4. According to the triangle interior angle sum theorem, 1= 2= 3= 4 = (65438! ! !