学习了平行线的内容后,我们经常会遇到以下两种图形:图形1“M”型如图1,AB∥CD,则∠E=∠A+∠C.图形2“U”型如图2,AB∥CD,则∠A+∠E+∠C=360°.两种不同的图形,形成的三个角之间的关系也不相同(要说明三个角之间的关系也不困难,只需过点E作其中一条直线的平行线,然后利用平行线的性质即可说明).能不能将这两种 After learning the contents of parallel lines, we often encounter the following two kinds of graphics: Graph 1 “M ” type shown in Figure 1, AB // CD, then ∠ E = ∠ A + ∠ C. Graph 2 “U” As shown in Figure 2, AB // CD, then ∠ A + ∠ E + ∠ C = 360 °. Two different shapes, the relationship between the three corners are not the same (to illustrate the relationship between the three angles nor Difficulty, just point E as one of the parallel lines of a straight line, and then use the nature of parallel lines to illustrate.) Can these two