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Answers for “线段的记法与直线的记法有何不同?”

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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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Two rays form a pair of opposite rays if they share the same endpoint and extend in exactly opposite directions (180 degrees apart) along the same line. Together, they form a complete line.

Conditions: There are two rays.; They have the same starting point (endpoint).; Their directions are opposite along the same straight path.

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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.