证两直线平行,往往通过同位角(内错角)相等或同旁内角互补从角的角度证,或通过平行四边形的对边平行证,这也是最常用的.有时若利用面积法证平行,则会让人感到耳目一新和解法的多样性,可开阔思维,拓展视野,甚至简捷明快,现举例加以说明. It is also most commonly used if the two lines are parallel, often with the same or different angle of internal complementarity, or parallel with the opposite side of the parallelogram, and sometimes the most commonly used area forensics, It will make people feel fresh and reconciliation diversity, can broaden their thinking, broaden their horizons, and even simple and neat, are examples to illustrate.