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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.

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.

Ray AC and ray BA are not opposite rays because they do not share the same endpoint. Ray AC starts at A, while ray BA starts at B.

Conditions: The rays are named $\overrightarrow{AC}$ and $\overrightarrow{BA}$.; Points A, B, and C are on a line.

Ray AC and ray BA are not opposite rays because they do not share the same endpoint. Ray AC starts at A, while ray BA starts at B.

Conditions: The rays are named $\overrightarrow{AC}$ and $\overrightarrow{BA}$.; Points A, B, and C are on a line.

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.

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.