File:Parallel_(PSF).png · Wikimedia Commons · See Wikimedia Commons
Also known as parallel, parallel to
relation used in geometry
Parallelism in geometry refers to the relationship between two lines or planes that never meet, no matter how far they are extended. This concept is important because it helps us understand and describe shapes, build structures, and solve mathematical problems involving distances and angles.
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Wikidata facts
- Instance of
- property
- Image
- Parallel (PSF).png
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- maintained by WikiProject
- WikiProject Mathematics
- facet of
- circle of latitude
- does not have part
- intersection
- on focus list of Wikimedia project
- Wikipedia:Vital articles/Level/4
- Commons category
- Parallel lines
- Unicode character
- ∥
- characteristic of
- plane
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Article · 中文
平行是一个几何学术语。在平面几何中,永远不会相交的多条直线,或者多个平面彼此互相平行。在欧几里得几何中,由平行公设,一个平面上的直线外指定一个点,就能指定出一条与它平行的直线。在非欧几何中,根据空间曲率的不同,在一条直线外指定一个点可以作多条或零条与它平行的直线。 在三维空间或一般的欧几里得空间中,直线或平面的平行关系视乎其方向向量或法向量,但與二維平面一樣,在一条直线外面指定一个点也只能表示一条与它平行的直线,并且在一个平面外指定一个点也只能指定一個与它平行的平面。然而,在一个平面外指定一个点可以指定和它平行的直线是无数条(这些直线都在与它平行的唯一一个平面上)。
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