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平行与垂直 PowerPoint PPT Presentation


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人教版第七册. 平行与垂直. a. b. 在同一个平面内. 不相交. 在同一个平面内 不相交的两条直线叫做 平行线 ,也可以说这两条直线 互相平行 。. 直线 a 是直线 b 的平行线, 直线 b 是直线 a 的平行线。. ×.  下面各图中哪些是平行线?哪些不是?为什么?. ③. ①. ②. ④. ⑤. ⑥. b. 两条. 在同一平面内,如果两条 直线相交成直角,就说这 两条直线 互相垂直 。. 直线相交成直角. 垂 足. 垂线. 其中一条直线叫做另一条 直线的 垂线。. a. 这两条直线的交点叫做 垂足 。.

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平行与垂直

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