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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.

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.

To name a ray, write the endpoint first, followed by a second point in the direction the ray extends, and place a one-way arrow above the letters. The arrow symbol always points to the right in notation, regardless of the drawn direction.

Conditions: The object being named is a ray.; Two points are available: the endpoint and a direction point.

To name a ray, write the endpoint first, followed by a second point in the direction the ray extends, and place a one-way arrow above the letters. The arrow symbol always points to the right in notation, regardless of the drawn direction.

Conditions: The object being named is a ray.; Two points are available: the endpoint and a direction point.