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Answers for “如何使用两个点来命名一条直线?”

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To name a line, choose any two points on the line and place a double-headed arrow symbol above their capital letter labels. The order of the two letters does not matter.

Conditions: The object being named is a line.; Two distinct points are chosen on that line.

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Segment notation uses a single overbar above the two endpoint letters, while line notation uses a double-headed arrow above the two point letters. A segment has two endpoints and is finite, whereas a line extends infinitely in both directions.

Conditions: The object is either a segment or a line.; Two points are used for naming.

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A plane can be named using a single capital letter placed at or near a corner of the plane diagram, or by using three non-collinear points on the plane.

Conditions: The object being named is a plane.; When using three points, they must not lie in a straight line.