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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.

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.

When two planes intersect, their intersection is a line. Unlike two lines that cross at a single point, two flat surfaces meeting in space share a common straight path.

Conditions: Two distinct planes are given.; The planes are not parallel or skew; they intersect.

When two planes intersect, their intersection is a line. Unlike two lines that cross at a single point, two flat surfaces meeting in space share a common straight path.

Conditions: Two distinct planes are given.; The planes are not parallel or skew; they intersect.